feat(i18n): bilingual UI (Russian + English) + language selector

Все UI-строки приложения переведены и переключаются на лету через
Settings → Язык интерфейса.

== i18n архитектура ==
- src/renderer/src/i18n/dict.ts — плоский словарь ru/en с ~190 ключами,
  поддержка интерполяции {var} и плюрализации
- src/renderer/src/i18n/index.ts — useT() React hook + чистые
  translate/translateN функции (для ReminderApp вне store context)
- Settings.language: 'ru' | 'en', default 'ru'
- Изменение языка применяется немедленно через Zustand reactive update

== Что переведено ==
- Sidebar nav + slogan + status
- Titlebar window controls (aria-labels)
- Dashboard: hero, 3 stat-карточки (Активных / До следующего /
  Трекинг матчей), Paused banner, empty state
- Exercises: hero, секции (активные / выключенные), row meta, empty
- Challenges: hero, formula subtitle, warning, row format
  «{stat} × {mult} → {exercise}», empty
- Games: hero, status badges (Live/Ready/Queued/Installed/Not found),
  queued/no_user banners, dev panel
- Settings: все секции + новый Language selector
- UpdaterCard: все состояния (checking/available/downloading/
  downloaded/error/idle) с интерполяцией версии и MB/s
- ReminderApp: kicker «Время тренировки», reps подпись, snooze label
  с динамическими минутами, кнопки done/skip
- Match summary: победа/поражение, плюрализация «N челлендж/-а/-ей»
  vs «N challenge/-s»
- Format helpers (formatCountdown, formatInterval) — теперь принимают
  Language параметр

== Локалезависимая дата ==
Dashboard hero показывает today в текущей локали:
  ru-RU → "воскресенье, 17 мая"
  en-US → "Sunday, May 17"

== STAT_LABELS bilingual ==
- shared/types.ts: STAT_LABELS_EN + statLabel(stat, lang) helper
- ChallengeResult получил поле stat?: GameStat (для resolve на стороне
  renderer'а с актуальным языком, вместо baked-in label)
- main/games/registry.ts кладёт stat в результат

== Тесты ==
- src/renderer/src/i18n/i18n.test.ts: 10 кейсов
  * translate: lookup, fallback, interpolation, multi-var, lang fallback
  * translateN: ru plural rules (1/21/101 → one; 2-4 → few; 0/5-20 → many)
    и en (1 → one, else → many)
- Всего 33 теста зелёные

== Известное ограничение ==
SAMPLE_EXERCISES (5-6 русских "Приседания / Отжимания / ...") остаются
русскими — это seed данных на первый запуск. Английский юзер сразу
переключит язык и сможет переименовать вручную. Делать seed-per-locale
оверкилл — слишком много кода ради малого.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "laude",
-  "version": "0.3.6",
+  "version": "0.4.0",
   "description": "Exercise reminder — Windows desktop app",
   "main": "out/main/index.js",
   "author": "AnRil",

src/main/games/registry.ts

@@ -38,7 +38,8 @@ async function onMatchEnd(gameId: GameId, payload: MatchEndPayload): Promise<voi
       exerciseName: ch.exerciseName,
       reps,
       statValue,
-      statLabel: STAT_LABELS[ch.stat]
+      statLabel: STAT_LABELS[ch.stat],
+      stat: ch.stat
     })
   }
   if (results.length === 0) return

src/main/updater.ts

@@ -7,7 +7,7 @@ let currentStatus: UpdaterStatus = { kind: 'idle' }
 let wired = false
 let checkInterval: NodeJS.Timeout | null = null
 
-const CHECK_INTERVAL_MS = 6 * 60 * 60 * 1000 // every 6 hours
+const CHECK_INTERVAL_MS = 60 * 60 * 1000 // every hour
 
 export function getUpdaterStatus(): UpdaterStatus {
   return currentStatus

src/renderer/src/App.tsx

@@ -22,10 +22,7 @@ export default function App(): JSX.Element {
   return (
     <HashRouter>
       <div className="h-screen w-screen flex flex-col bg-bg">
-        <Titlebar
-          title="Exercise Reminder"
-          onMenuClick={() => setMobileNavOpen(true)}
-        />
+        <Titlebar onMenuClick={() => setMobileNavOpen(true)} />
         <div className="flex-1 flex overflow-hidden">
           <Sidebar
             mobileOpen={mobileNavOpen}

src/renderer/src/ReminderApp.tsx

@@ -5,10 +5,13 @@ import type {
   Exercise,
   MatchSummary,
   Settings,
-  ChallengeResult
+  ChallengeResult,
+  Language
 } from '@shared/types'
+import { statLabel } from '@shared/types'
 import { Icon } from './lib/icon'
 import { formatInterval } from './lib/format'
+import { translate, translateN } from './i18n'
 
 type Mode =
   | { kind: 'idle' }
@@ -42,7 +45,6 @@ export default function ReminderApp(): JSX.Element {
     }
   }, [])
 
-  // Keyboard shortcuts (iOS-like Enter to confirm)
   useEffect(() => {
     if (mode.kind !== 'exercise') return
     const ex = mode.exercise
@@ -67,12 +69,15 @@ export default function ReminderApp(): JSX.Element {
     window.api.reminderClose()
   }
 
+  const lang: Language = settings?.language ?? 'ru'
+
   if (mode.kind === 'idle') return <div className="reminder-shell" />
   if (mode.kind === 'exercise') {
     return (
       <ExerciseReminder
         exercise={mode.exercise}
         snoozeMinutes={settings?.snoozeMinutes ?? 5}
+        lang={lang}
         onClose={close}
       />
     )
@@ -81,6 +86,7 @@ export default function ReminderApp(): JSX.Element {
     <MatchSummaryView
       summary={mode.summary}
       done={mode.done}
+      lang={lang}
       onMarkDone={(id) =>
         setMode({
           kind: 'match',
@@ -96,12 +102,17 @@ export default function ReminderApp(): JSX.Element {
 function ExerciseReminder({
   exercise,
   snoozeMinutes,
+  lang,
   onClose
 }: {
   exercise: Exercise
   snoozeMinutes: number
+  lang: Language
   onClose: () => void
 }): JSX.Element {
+  const t = (key: string, vars?: Record<string, string | number>): string =>
+    translate(lang, key, vars)
+
   async function done(): Promise<void> {
     await window.api.markDone(exercise.id)
     onClose()
@@ -121,7 +132,7 @@ function ExerciseReminder({
         <button
           onClick={onClose}
           className="titlebar-nodrag w-7 h-6 grid place-items-center rounded-md hover:bg-destructive hover:text-white text-text/45 active:scale-90 transition-all"
-          aria-label="Закрыть"
+          aria-label={t('btn.close')}
         >
           <X size={13} strokeWidth={2.5} />
         </button>
@@ -140,7 +151,7 @@ function ExerciseReminder({
         </motion.div>
 
         <div className="text-[13px] uppercase tracking-[0.18em] text-accent font-bold">
-          Время тренировки
+          {t('reminder.kicker')}
         </div>
         <h1 className="font-serif text-[30px] leading-tight tracking-tight mt-2 mb-3 font-bold">
           {exercise.name}
@@ -150,35 +161,39 @@ function ExerciseReminder({
           <span className="text-[56px] font-semibold tracking-tight text-text leading-none">
             {exercise.reps}
           </span>
-          <span className="text-[15px] text-text/65 font-semibold">раз</span>
+          <span className="text-[15px] text-text/65 font-semibold">
+            {t('reminder.reps')}
+          </span>
         </div>
 
         <div className="text-[13px] text-text/65 mt-4 inline-flex items-center gap-1.5 font-medium">
           <Clock size={12} strokeWidth={2.4} />
-          Следующее через {formatInterval(exercise.intervalMinutes)}
+          {t('reminder.next_in', {
+            interval: formatInterval(exercise.intervalMinutes, lang)
+          })}
         </div>
       </div>
 
-      {/* iOS action sheet — buttons stacked vertically, equal width */}
       <div className="px-4 pb-4 space-y-2">
         <button
           onClick={done}
           className="w-full h-12 rounded-2xl bg-accent text-white text-[16px] font-bold inline-flex items-center justify-center gap-1.5 active:scale-[0.98] transition-transform"
         >
-          <Check size={17} strokeWidth={2.5} /> Готово
+          <Check size={17} strokeWidth={2.5} /> {t('reminder.btn.done')}
         </button>
         <div className="grid grid-cols-2 gap-2">
           <button
             onClick={snooze}
             className="h-11 rounded-2xl bg-surface-2 text-text text-[15px] font-semibold inline-flex items-center justify-center gap-1.5 active:scale-[0.98] transition-transform"
           >
-            <Clock size={15} strokeWidth={2.5} /> {snoozeMinutes} мин
+            <Clock size={15} strokeWidth={2.5} />{' '}
+            {t('btn.snooze_min', { n: snoozeMinutes })}
           </button>
           <button
             onClick={skip}
             className="h-11 rounded-2xl bg-surface-2 text-text/65 text-[15px] font-semibold inline-flex items-center justify-center gap-1.5 active:scale-[0.98] transition-transform"
           >
-            Пропустить
+            {t('btn.skip')}
           </button>
         </div>
       </div>
@@ -189,14 +204,24 @@ function ExerciseReminder({
 function MatchSummaryView({
   summary,
   done,
+  lang,
   onMarkDone,
   onClose
 }: {
   summary: MatchSummary
   done: Set<string>
+  lang: Language
   onMarkDone: (id: string) => void
   onClose: () => void
 }): JSX.Element {
+  const t = (key: string, vars?: Record<string, string | number>): string =>
+    translate(lang, key, vars)
+  const tn = (
+    base: string,
+    n: number,
+    vars?: Record<string, string | number>
+  ): string => translateN(lang, base, n, vars)
+
   const allDone = summary.results.every((r) => done.has(r.challengeId))
   const totalReps = summary.results.reduce((s, r) => s + r.reps, 0)
   const remainingReps = summary.results
@@ -204,6 +229,7 @@ function MatchSummaryView({
     .reduce((s, r) => s + r.reps, 0)
   const won = summary.won === true
   const lost = summary.won === false
+  const minutes = Math.floor(summary.durationMs / 60_000)
 
   return (
     <div className="reminder-shell flex flex-col h-full">
@@ -214,7 +240,7 @@ function MatchSummaryView({
         <button
           onClick={onClose}
           className="titlebar-nodrag w-7 h-6 grid place-items-center rounded-md hover:bg-destructive hover:text-white text-text/45 active:scale-90 transition-all"
-          aria-label="Закрыть"
+          aria-label={t('btn.close')}
         >
           <X size={13} strokeWidth={2.5} />
         </button>
@@ -239,19 +265,23 @@ function MatchSummaryView({
           )}
         </motion.div>
         <h1 className="font-serif text-[26px] tracking-tight font-bold">
-          {won ? 'Победа' : lost ? 'Поражение' : 'Матч завершён'}
+          {won
+            ? t('match.title.won')
+            : lost
+              ? t('match.title.lost')
+              : t('match.title.draw')}
         </h1>
         <p className="text-[13px] text-text/65 mt-1.5 font-medium">
-          <span className="font-mono-num font-bold text-text">
-            {Math.floor(summary.durationMs / 60_000)}
-          </span>{' '}
-          мин · {summary.results.length} челлендж
-          {summary.results.length === 1 ? '' : 'а'} ·{' '}
+          <span className="font-mono-num font-bold text-text">{minutes}</span>{' '}
+          {t('fmt.m')} ·{' '}
+          {tn('match.summary.challenges', summary.results.length)}{' · '}
           {allDone ? (
-            <span className="text-success font-bold">всё готово</span>
+            <span className="text-success font-bold">
+              {t('match.summary.all_done')}
+            </span>
           ) : (
             <span className="text-accent font-mono-num font-bold">
-              {remainingReps} осталось
+              {t('match.summary.remaining', { n: remainingReps })}
             </span>
           )}
         </p>
@@ -262,6 +292,7 @@ function MatchSummaryView({
           <ChallengeRow
             key={r.challengeId}
             result={r}
+            lang={lang}
             done={done.has(r.challengeId)}
             onMarkDone={() => onMarkDone(r.challengeId)}
           />
@@ -270,11 +301,11 @@ function MatchSummaryView({
 
       <div className="px-4 pb-4 pt-3 flex items-center gap-3">
         <div className="flex-1 text-[13px] text-text/65 font-medium">
-          Всего ·{' '}
+          {t('match.total')} ·{' '}
           <span className="text-text font-mono-num font-bold text-[16px]">
             {totalReps}
           </span>{' '}
-          повторов
+          {t('match.total_reps_suffix')}
         </div>
         <button
           onClick={onClose}
@@ -285,10 +316,10 @@ function MatchSummaryView({
         >
           {allDone ? (
             <>
-              <Check size={14} strokeWidth={2.5} /> Закрыть
+              <Check size={14} strokeWidth={2.5} /> {t('btn.close')}
             </>
           ) : (
-            'Позже'
+            t('btn.later')
           )}
         </button>
       </div>
@@ -298,13 +329,16 @@ function MatchSummaryView({
 
 function ChallengeRow({
   result,
+  lang,
   done,
   onMarkDone
 }: {
   result: ChallengeResult
+  lang: Language
   done: boolean
   onMarkDone: () => void
 }): JSX.Element {
+  const label = result.stat ? statLabel(result.stat, lang) : result.statLabel
   return (
     <motion.div
       layout
@@ -336,7 +370,7 @@ function ChallengeRow({
           <span className="font-mono-num font-bold text-text">
             {result.statValue}
           </span>{' '}
-          {result.statLabel} → <span>{result.name}</span>
+          {label} → <span>{result.name}</span>
         </div>
       </div>
       <div
@@ -356,7 +390,6 @@ function ChallengeRow({
             ? 'bg-success text-white cursor-default'
             : 'bg-accent text-white active:scale-90'
         ].join(' ')}
-        aria-label="Готово"
       >
         <Check size={15} strokeWidth={2.5} />
       </button>

src/renderer/src/components/ExerciseCard.tsx

@@ -5,6 +5,7 @@ import type { Exercise, Tick } from '@shared/types'
 import { Icon } from '../lib/icon'
 import { formatCountdown, formatInterval } from '../lib/format'
 import { Switch } from './ui/Switch'
+import { useT } from '../i18n'
 
 type Props = {
   exercise: Exercise
@@ -34,6 +35,7 @@ export function ExerciseCard({
   const elapsedPct = total > 0 ? 1 - remaining / total : 0
   const isDue = ms <= 0 && exercise.enabled
   const [menuOpen, setMenuOpen] = useState(false)
+  const { t, lang } = useT()
 
   // Ring math
   const R = 22
@@ -104,7 +106,7 @@ export function ExerciseCard({
               <button
                 onClick={() => setMenuOpen((v) => !v)}
                 className="w-7 h-7 grid place-items-center rounded-full text-text/45 hover:bg-surface-2 active:scale-90 transition-all"
-                aria-label="Меню"
+                aria-label={t('titlebar.menu_aria')}
               >
                 <MoreHorizontal size={16} />
               </button>
@@ -122,7 +124,7 @@ export function ExerciseCard({
                       }}
                       className="w-full text-left px-3 py-2 text-[13px] hover:bg-surface-2 active:bg-hairline/25"
                     >
-                      Редактировать
+                      {t('btn.edit')}
                     </button>
                     <button
                       onClick={() => {
@@ -131,7 +133,7 @@ export function ExerciseCard({
                       }}
                       className="w-full text-left px-3 py-2 text-[13px] text-destructive hover:bg-destructive/10 active:bg-destructive/15"
                     >
-                      Удалить
+                      {t('btn.delete')}
                     </button>
                   </div>
                 </>
@@ -139,14 +141,17 @@ export function ExerciseCard({
             </div>
           </div>
           <div className="text-[14px] text-text/65 mt-1 font-medium">
-            {exercise.reps} раз · каждые {formatInterval(exercise.intervalMinutes)}
+            {t('editor.exercise.preview.meta', {
+              reps: exercise.reps,
+              min: exercise.intervalMinutes
+            })}
           </div>
 
           {/* Countdown + switch */}
           <div className="flex items-end justify-between mt-3.5">
             <div>
               <div className="text-[12px] text-text/60 uppercase tracking-wider font-semibold">
-                {isDue ? 'Сейчас' : 'Через'}
+                {isDue ? t('dashboard.stat.next.now') : t('fmt.through')}
               </div>
               <div
                 className={[
@@ -154,19 +159,20 @@ export function ExerciseCard({
                   isDue ? 'text-accent' : 'text-text'
                 ].join(' ')}
               >
-                {exercise.enabled ? formatCountdown(ms) : 'на паузе'}
+                {exercise.enabled
+                  ? formatCountdown(ms, lang)
+                  : t('fmt.paused')}
               </div>
             </div>
             <Switch
               checked={exercise.enabled}
               onChange={onToggle}
-              aria-label="Включить/выключить"
+              aria-label={t('btn.done')}
             />
           </div>
         </div>
       </div>
 
-      {/* Done action — appears as filled pill at bottom only on due */}
       {isDue && (
         <motion.button
           initial={{ opacity: 0, y: 4 }}
@@ -174,7 +180,7 @@ export function ExerciseCard({
           onClick={onMarkDone}
           className="mt-4 w-full h-11 rounded-xl bg-accent text-white text-[15px] font-bold inline-flex items-center justify-center gap-1.5 active:scale-[0.98] transition-transform"
         >
-          <Check size={15} strokeWidth={2.5} /> Готово
+          <Check size={15} strokeWidth={2.5} /> {t('btn.done')}
         </motion.button>
       )}
     </motion.div>

src/renderer/src/components/ExerciseEditor.tsx

@@ -3,6 +3,7 @@ import type { Exercise } from '@shared/types'
 import { Modal } from './ui/Modal'
 import { Button } from './ui/Button'
 import { ICON_CHOICES, Icon } from '../lib/icon'
+import { useT } from '../i18n'
 
 type Draft = {
   name: string
@@ -34,6 +35,7 @@ export function ExerciseEditor({
   onSave
 }: Props): JSX.Element {
   const [draft, setDraft] = useState<Draft>(EMPTY)
+  const { t } = useT()
 
   useEffect(() => {
     if (exercise) {
@@ -55,46 +57,52 @@ export function ExerciseEditor({
     <Modal
       open={open}
       onClose={onClose}
-      title={exercise ? 'Редактировать' : 'Новое упражнение'}
+      title={
+        exercise
+          ? t('editor.exercise.title.edit')
+          : t('editor.exercise.title.new')
+      }
       footer={
         <>
           <Button variant="plain" onClick={onClose}>
-            Отмена
+            {t('btn.cancel')}
           </Button>
           <Button disabled={!canSave} onClick={() => onSave(draft)}>
-            Сохранить
+            {t('btn.save')}
           </Button>
         </>
       }
     >
       <div className="space-y-5">
-        {/* Live preview header */}
         <div className="rounded-2xl bg-surface-2 p-4 flex items-center gap-4">
           <div className="w-14 h-14 rounded-2xl bg-accent text-white grid place-items-center shrink-0">
             <Icon name={draft.icon} size={26} strokeWidth={2.2} />
           </div>
           <div className="min-w-0">
             <div className="font-display text-[18px] font-semibold tracking-tight truncate">
-              {draft.name || 'Без названия'}
+              {draft.name || t('editor.exercise.preview.placeholder')}
             </div>
             <div className="text-[13px] text-text/55 mt-0.5 font-mono-num">
-              {draft.reps} раз · каждые {draft.intervalMinutes} мин
+              {t('editor.exercise.preview.meta', {
+                reps: draft.reps,
+                min: draft.intervalMinutes
+              })}
             </div>
           </div>
         </div>
 
-        <Field label="Название">
+        <Field label={t('editor.field.name')}>
           <input
             value={draft.name}
             onChange={(e) => setDraft({ ...draft, name: e.target.value })}
-            placeholder="Приседания"
+            placeholder={t('editor.field.name.placeholder')}
             className="ios-input"
             autoFocus
           />
         </Field>
 
         <div className="grid grid-cols-2 gap-3">
-          <Field label="Повторений">
+          <Field label={t('editor.field.reps')}>
             <input
               type="number"
               min={1}
@@ -108,7 +116,7 @@ export function ExerciseEditor({
               className="ios-input font-mono-num"
             />
           </Field>
-          <Field label="Интервал (мин)">
+          <Field label={t('editor.field.interval_min')}>
             <input
               type="number"
               min={1}
@@ -124,7 +132,7 @@ export function ExerciseEditor({
           </Field>
         </div>
 
-        <Field label="Иконка">
+        <Field label={t('editor.field.icon')}>
           <div className="grid grid-cols-8 gap-2 max-h-44 overflow-y-auto p-2 rounded-2xl bg-surface-2">
             {ICON_CHOICES.map((name) => (
               <button

src/renderer/src/components/Sidebar.tsx

@@ -8,29 +8,34 @@ import {
   Settings2,
   X
 } from 'lucide-react'
+import { useT } from '../i18n'
 
 type Item = {
   to: string
-  label: string
+  labelKey: string
   icon: typeof Sun
   end?: boolean
   tint?: string
 }
 
-// Tinted icon plaques á la iOS Settings rows.
 const items: Item[] = [
-  { to: '/', label: 'Сегодня', icon: Sun, end: true, tint: 'bg-accent' },
+  { to: '/', labelKey: 'nav.today', icon: Sun, end: true, tint: 'bg-accent' },
   {
     to: '/exercises',
-    label: 'Упражнения',
+    labelKey: 'nav.exercises',
     icon: Dumbbell,
     tint: 'bg-info'
   },
-  { to: '/games', label: 'Игры', icon: Joystick, tint: 'bg-accent-2' },
-  { to: '/challenges', label: 'Челленджи', icon: Flame, tint: 'bg-warning' },
+  { to: '/games', labelKey: 'nav.games', icon: Joystick, tint: 'bg-accent-2' },
+  {
+    to: '/challenges',
+    labelKey: 'nav.challenges',
+    icon: Flame,
+    tint: 'bg-warning'
+  },
   {
     to: '/settings',
-    label: 'Настройки',
+    labelKey: 'nav.settings',
     icon: Settings2,
     tint: 'bg-text/70'
   }
@@ -45,14 +50,13 @@ export function Sidebar({
   mobileOpen = false,
   onMobileClose
 }: Props): JSX.Element {
+  const { t } = useT()
   return (
     <>
-      {/* Desktop sidebar — macOS vibrancy panel */}
       <aside className="hidden md:flex w-64 shrink-0 vibrancy hairline-b border-r-0 flex-col">
         <SidebarContent />
       </aside>
 
-      {/* Mobile drawer */}
       <AnimatePresence>
         {mobileOpen && (
           <motion.div
@@ -79,7 +83,7 @@ export function Sidebar({
               <button
                 onClick={onMobileClose}
                 className="absolute top-3 right-3 w-8 h-8 grid place-items-center rounded-full bg-surface-2 hover:bg-hairline/25 text-text/60 transition-colors active:scale-90"
-                aria-label="Закрыть"
+                aria-label={t('btn.close')}
               >
                 <X size={14} strokeWidth={2.5} />
               </button>
@@ -93,21 +97,20 @@ export function Sidebar({
 }
 
 function SidebarContent({ onNav }: { onNav?: () => void }): JSX.Element {
+  const { t } = useT()
   return (
     <>
-      {/* Brand */}
       <div className="px-5 pt-7 pb-6">
         <div className="font-serif text-[36px] leading-none tracking-tight font-bold">
           Laude
         </div>
         <div className="text-[13px] text-text/55 mt-2 font-medium">
-          Двигайся осознанно
+          {t('sidebar.slogan')}
         </div>
       </div>
 
-      {/* Nav */}
       <nav className="px-2.5 flex flex-col gap-1">
-        {items.map(({ to, label, icon: Icon, end, tint }) => (
+        {items.map(({ to, labelKey, icon: Icon, end, tint }) => (
           <NavLink
             key={to}
             to={to}
@@ -140,7 +143,7 @@ function SidebarContent({ onNav }: { onNav?: () => void }): JSX.Element {
                       : 'text-text/85 font-medium'
                   ].join(' ')}
                 >
-                  {label}
+                  {t(labelKey)}
                 </span>
               </>
             )}
@@ -148,14 +151,13 @@ function SidebarContent({ onNav }: { onNav?: () => void }): JSX.Element {
         ))}
       </nav>
 
-      {/* Status footer */}
       <div className="mt-auto px-5 pb-5">
         <div className="flex items-center gap-2 text-[11px] text-text/45">
           <span className="relative flex h-1.5 w-1.5">
             <span className="absolute inline-flex h-full w-full rounded-full bg-success opacity-60 animate-ping" />
             <span className="relative inline-flex rounded-full h-1.5 w-1.5 bg-success" />
           </span>
-          Активность отслеживается
+          {t('sidebar.status_tracking')}
         </div>
       </div>
     </>

src/renderer/src/components/Titlebar.tsx

@@ -1,46 +1,49 @@
 import { Minus, X, Square, Menu } from 'lucide-react'
+import { useT } from '../i18n'
 
 type Props = {
-  title: string
+  title?: string
   onMenuClick?: () => void
 }
 
-/**
- * macOS-style translucent titlebar. Title centred small, no app icon.
- * Window buttons sit right; a left-side hamburger surfaces on mobile only.
- */
 export function Titlebar({ title, onMenuClick }: Props): JSX.Element {
+  const { t } = useT()
+  const effectiveTitle = title ?? t('titlebar.app_title')
+
   return (
     <div className="titlebar-drag relative h-10 px-2 sm:px-3 flex items-center justify-between vibrancy hairline-b">
-      {/* Left: hamburger only on small */}
       <div className="flex items-center gap-1 min-w-0 flex-1 basis-0">
         {onMenuClick && (
           <button
             onClick={onMenuClick}
-            className="titlebar-nodrag md:hidden w-8 h-7 grid place-items-center rounded-md hover:bg-text/[0.08] text-text/65 transition-colors"
-            aria-label="Меню"
+            className="titlebar-nodrag md:hidden w-8 h-7 grid place-items-center rounded-md hover:bg-text/[0.08] text-text/65 hover:text-text transition-colors"
+            aria-label={t('titlebar.menu_aria')}
           >
             <Menu size={15} strokeWidth={2} />
           </button>
         )}
       </div>
 
-      {/* Centre title */}
       <div className="text-[12px] font-medium text-text/55 truncate px-2">
-        {title}
+        {effectiveTitle}
       </div>
 
-      {/* Right window controls */}
       <div className="titlebar-nodrag flex items-center justify-end gap-0.5 min-w-0 flex-1 basis-0">
-        <WinBtn onClick={() => window.api.minimizeMain()} label="Свернуть">
+        <WinBtn
+          onClick={() => window.api.minimizeMain()}
+          label={t('titlebar.minimize_aria')}
+        >
           <Minus size={13} strokeWidth={2} />
         </WinBtn>
-        <WinBtn onClick={() => window.api.hideMain()} label="В трей">
+        <WinBtn
+          onClick={() => window.api.hideMain()}
+          label={t('titlebar.tray_aria')}
+        >
           <Square size={11} strokeWidth={2} />
         </WinBtn>
         <WinBtn
           onClick={() => window.api.closeMain()}
-          label="Закрыть"
+          label={t('titlebar.close_aria')}
           danger
         >
           <X size={13} strokeWidth={2} />

src/renderer/src/components/UpdaterCard.tsx

@@ -10,6 +10,7 @@ import {
 import { motion } from 'framer-motion'
 import { Button } from './ui/Button'
 import { Card } from './ui/Card'
+import { useT } from '../i18n'
 import type { UpdaterStatus } from '@shared/types'
 
 export function UpdaterCard(): JSX.Element {
@@ -67,13 +68,15 @@ function Body({
   onDownload: () => void
   onInstall: () => void
 }): JSX.Element {
+  const { t } = useT()
+
   if (status.kind === 'unsupported') {
     return (
       <Cell
         tone="muted"
         icon={<AlertTriangle size={16} strokeWidth={2.4} />}
-        title="Auto-update недоступен"
-        subtitle={status.reason}
+        title={t('updater.unsupported')}
+        subtitle={t('updater.unsupported.reason_dev')}
       />
     )
   }
@@ -81,8 +84,14 @@ function Body({
     return (
       <Cell
         tone="info"
-        icon={<RefreshCw size={16} strokeWidth={2.4} className="animate-spin" />}
-        title="Проверяем обновления…"
+        icon={
+          <RefreshCw
+            size={16}
+            strokeWidth={2.4}
+            className="animate-spin"
+          />
+        }
+        title={t('updater.checking')}
       />
     )
   }
@@ -91,11 +100,11 @@ function Body({
       <Cell
         tone="success"
         icon={<CheckCircle2 size={16} strokeWidth={2.4} />}
-        title="Последняя версия"
-        subtitle={`Текущая: v${status.currentVersion}`}
+        title={t('updater.up_to_date')}
+        subtitle={t('updater.up_to_date.subtitle', { v: status.currentVersion })}
         action={
           <Button variant="tinted" size="sm" onClick={onCheck} disabled={busy}>
-            <RefreshCw size={13} strokeWidth={2.5} /> Проверить
+            <RefreshCw size={13} strokeWidth={2.5} /> {t('btn.check')}
           </Button>
         }
       />
@@ -106,15 +115,15 @@ function Body({
       <Cell
         tone="accent"
         icon={<Sparkles size={16} strokeWidth={2.4} />}
-        title={`Доступна v${status.version}`}
+        title={t('updater.available.title', { v: status.version })}
         subtitle={
           status.releaseDate
-            ? new Date(status.releaseDate).toLocaleString('ru-RU')
+            ? new Date(status.releaseDate).toLocaleString()
             : undefined
         }
         action={
           <Button size="sm" onClick={onDownload} disabled={busy}>
-            <Download size={13} strokeWidth={2.5} /> Скачать
+            <Download size={13} strokeWidth={2.5} /> {t('btn.download')}
           </Button>
         }
       />
@@ -131,11 +140,14 @@ function Body({
           </div>
           <div className="flex-1 min-w-0">
             <div className="text-[15px] font-semibold leading-tight">
-              Загружаем обновление
+              {t('updater.downloading.title')}
             </div>
             <div className="text-[13px] text-text/65 mt-1 font-mono-num font-medium">
-              {mb(status.transferred)} / {mb(status.total)} МБ ·{' '}
-              {(status.bytesPerSecond / 1024 / 1024).toFixed(2)} МБ/с
+              {t('updater.downloading.subtitle', {
+                got: mb(status.transferred),
+                total: mb(status.total),
+                speed: (status.bytesPerSecond / 1024 / 1024).toFixed(2)
+              })}
             </div>
           </div>
           <div className="font-mono-num font-bold text-[18px] text-accent">
@@ -157,11 +169,11 @@ function Body({
       <Cell
         tone="success"
         icon={<CheckCircle2 size={16} strokeWidth={2.4} />}
-        title={`Готово · v${status.version}`}
-        subtitle="Перезапусти для применения"
+        title={t('updater.downloaded.title', { v: status.version })}
+        subtitle={t('updater.downloaded.subtitle')}
         action={
           <Button variant="filled" size="sm" onClick={onInstall}>
-            Перезапустить
+            {t('btn.restart')}
           </Button>
         }
       />
@@ -172,11 +184,11 @@ function Body({
       <Cell
         tone="destructive"
         icon={<AlertTriangle size={16} strokeWidth={2.4} />}
-        title="Ошибка проверки"
+        title={t('updater.error.title')}
         subtitle={status.message}
         action={
           <Button variant="tinted" size="sm" onClick={onCheck} disabled={busy}>
-            <RefreshCw size={13} strokeWidth={2.5} /> Повторить
+            <RefreshCw size={13} strokeWidth={2.5} /> {t('btn.retry')}
           </Button>
         }
       />
@@ -186,11 +198,11 @@ function Body({
     <Cell
       tone="muted"
       icon={<PackageCheck size={16} strokeWidth={2.4} />}
-      title="Проверить обновления"
-      subtitle="Авто-проверка раз в 6 часов"
+      title={t('updater.idle.title')}
+      subtitle={t('updater.idle.subtitle')}
       action={
         <Button size="sm" onClick={onCheck} disabled={busy}>
-          <RefreshCw size={13} strokeWidth={2.5} /> Проверить
+          <RefreshCw size={13} strokeWidth={2.5} /> {t('btn.check')}
         </Button>
       }
     />

src/renderer/src/i18n/dict.ts

@@ -0,0 +1,414 @@
+/**
+ * Flat string dictionary for ru/en. Keys use dot notation but are just
+ * strings — no nesting overhead.
+ *
+ * Interpolation: `{name}` placeholders are replaced via `useT()` helper.
+ *
+ * Pluralization: keys ending in `.one`/`.few`/`.many` (ru) or
+ * `.one`/`.other` (en) are picked by `tn()` helper based on count.
+ */
+
+export type Dict = Record<string, string>
+
+export const ru: Dict = {
+  // Sidebar / nav
+  'nav.today': 'Сегодня',
+  'nav.exercises': 'Упражнения',
+  'nav.games': 'Игры',
+  'nav.challenges': 'Челленджи',
+  'nav.settings': 'Настройки',
+  'sidebar.slogan': 'Двигайся осознанно',
+  'sidebar.status_tracking': 'Активность отслеживается',
+  'titlebar.menu_aria': 'Меню',
+  'titlebar.minimize_aria': 'Свернуть',
+  'titlebar.tray_aria': 'В трей',
+  'titlebar.close_aria': 'Закрыть',
+  'titlebar.app_title': 'Exercise Reminder',
+
+  // Common buttons / actions
+  'btn.add': 'Добавить',
+  'btn.new': 'Новый',
+  'btn.cancel': 'Отмена',
+  'btn.save': 'Сохранить',
+  'btn.done': 'Готово',
+  'btn.start': 'Старт',
+  'btn.pause': 'Пауза',
+  'btn.refresh': 'Обновить',
+  'btn.edit': 'Редактировать',
+  'btn.delete': 'Удалить',
+  'btn.snooze_min': 'Отложить {n} мин',
+  'btn.skip': 'Пропустить',
+  'btn.close': 'Закрыть',
+  'btn.later': 'Позже',
+  'btn.connect': 'Подключить',
+  'btn.disconnect': 'Отключить',
+  'btn.check': 'Проверить',
+  'btn.download': 'Скачать',
+  'btn.restart': 'Перезапустить',
+  'btn.retry': 'Повторить',
+
+  // Dashboard
+  'dashboard.kicker': 'Тренировка дня',
+  'dashboard.title': 'Сегодня',
+  'dashboard.stat.active': 'Активных',
+  'dashboard.stat.active.of': 'из {total}',
+  'dashboard.stat.next': 'До следующего',
+  'dashboard.stat.next.now': 'Сейчас',
+  'dashboard.stat.next.subtitle_paused': 'на паузе',
+  'dashboard.stat.next.subtitle_running': 'отсчёт идёт',
+  'dashboard.stat.tracking': 'Трекинг матчей',
+  'dashboard.stat.tracking.on': 'On',
+  'dashboard.stat.tracking.off': 'Off',
+  'dashboard.stat.tracking.subtitle_on': 'в реальном времени',
+  'dashboard.stat.tracking.subtitle_off': 'выключен',
+  'dashboard.paused.title': 'Напоминания на паузе',
+  'dashboard.paused.hint': 'Возобнови, чтобы продолжить отсчёт',
+  'dashboard.empty.title': 'Программа пуста',
+  'dashboard.empty.hint': 'Добавь первое упражнение, чтобы начать',
+
+  // Exercises
+  'exercises.kicker': 'Программа',
+  'exercises.title': 'Упражнения',
+  'exercises.section.active': 'Активные · {n}',
+  'exercises.section.disabled': 'Выключенные · {n}',
+  'exercises.row.meta': '{reps} раз · {interval}',
+  'exercises.empty': 'Программа пуста — добавь первое упражнение',
+
+  // Exercise editor
+  'editor.exercise.title.new': 'Новое упражнение',
+  'editor.exercise.title.edit': 'Редактировать',
+  'editor.exercise.preview.placeholder': 'Без названия',
+  'editor.exercise.preview.meta': '{reps} раз · каждые {min} мин',
+  'editor.field.name': 'Название',
+  'editor.field.name.placeholder': 'Приседания',
+  'editor.field.reps': 'Повторений',
+  'editor.field.interval_min': 'Интервал (мин)',
+  'editor.field.icon': 'Иконка',
+
+  // Challenges
+  'challenges.kicker': 'Правила за матч',
+  'challenges.title': 'Челленджи',
+  'challenges.subtitle': 'Повторов = {formula}',
+  'challenges.subtitle.formula': 'статистика × коэффициент',
+  'challenges.warning.no_games':
+    'Челленджи срабатывают после матча. Подключи игру во вкладке «Игры».',
+  'challenges.section.all': 'Все · {n}',
+  'challenges.empty':
+    'Челленджей пока нет. Привяжи упражнение к статистике матча.',
+
+  // Challenge editor
+  'editor.challenge.title.new': 'Новый челлендж',
+  'editor.challenge.title.edit': 'Редактировать',
+  'editor.field.challenge_name': 'Название',
+  'editor.field.challenge_name.placeholder': 'За смерти — приседания',
+  'editor.field.game': 'Игра',
+  'editor.field.stat': 'Статистика',
+  'editor.field.multiplier': 'Коэффициент',
+  'editor.field.exercise_name': 'Упражнение',
+  'editor.field.exercise_name.placeholder': 'Приседания',
+  'editor.challenge.preview.kicker': 'Превью · 5 событий',
+  'editor.challenge.preview.fallback': 'повторов',
+
+  // Games
+  'games.kicker': 'Трекинг матчей',
+  'games.title': 'Игры',
+  'games.subtitle':
+    'Подключи игру — челленджи сработают сразу после матча',
+  'games.subtitle.live': '{n} live',
+  'games.section.supported': 'Поддерживаемые',
+  'games.scanning': 'Сканируем установленные игры…',
+  'games.queued.body':
+    'Steam запущен. Параметр {opt} пропишется автоматически при следующем закрытии Steam.',
+  'games.no_user.body':
+    'В Steam нет залогиненного аккаунта (нет папки userdata). Запусти Steam один раз и нажми «Установить интеграцию».',
+  'games.not_installed.hint': 'Установи игру в Steam и нажми «Обновить»',
+  'games.dev.toggle': 'dev · симулировать конец матча',
+  'games.badge.live': 'Live',
+  'games.badge.ready': 'Готово',
+  'games.badge.queued': 'В очереди',
+  'games.badge.installed': 'Установлена',
+  'games.badge.not_found': 'Не найдена',
+
+  // Settings
+  'settings.kicker': 'Конфигурация',
+  'settings.title': 'Настройки',
+  'settings.section.reminders': 'Напоминания',
+  'settings.section.window': 'Окно и трей',
+  'settings.section.appearance': 'Внешний вид',
+  'settings.section.language': 'Язык',
+  'settings.section.updates': 'Обновления',
+  'settings.notification_mode.label': 'Режим уведомления',
+  'settings.notification_mode.hint': 'Как должно выглядеть напоминание',
+  'settings.notification_mode.modal': 'Окно поверх всех',
+  'settings.notification_mode.toast': 'Системное уведомление',
+  'settings.notification_mode.both': 'Окно и уведомление',
+  'settings.sound.label': 'Звук уведомления',
+  'settings.sound.hint': 'Короткий сигнал при срабатывании',
+  'settings.snooze.label': '«Отложить» на',
+  'settings.snooze.hint': 'Сколько минут добавлять при отложении',
+  'settings.snooze.1': '1 минута',
+  'settings.snooze.5': '5 минут',
+  'settings.snooze.10': '10 минут',
+  'settings.snooze.15': '15 минут',
+  'settings.snooze.30': '30 минут',
+  'settings.tray.label': 'Сворачивать в трей',
+  'settings.tray.hint': 'При закрытии остаётся работать в фоне',
+  'settings.autostart.label': 'Запускать с Windows',
+  'settings.autostart.hint': 'Открывать при входе в систему',
+  'settings.start_minimized.label': 'Запускать свёрнутым',
+  'settings.start_minimized.hint': 'При автозапуске открывать сразу в трее',
+  'settings.theme.label': 'Тема',
+  'settings.theme.hint': 'Светлая / тёмная / как в системе',
+  'settings.theme.system': 'Как в системе',
+  'settings.theme.light': 'Светлая',
+  'settings.theme.dark': 'Тёмная',
+  'settings.language.label': 'Язык интерфейса',
+  'settings.language.hint': 'Применяется сразу',
+  'settings.language.ru': 'Русский',
+  'settings.language.en': 'English',
+  'settings.loading': 'Загрузка…',
+
+  // Updater
+  'updater.unsupported': 'Auto-update недоступен',
+  'updater.unsupported.reason_dev': 'Auto-update недоступен в dev-режиме',
+  'updater.checking': 'Проверяем обновления…',
+  'updater.up_to_date': 'Последняя версия',
+  'updater.up_to_date.subtitle': 'Текущая: v{v}',
+  'updater.available.title': 'Доступна v{v}',
+  'updater.downloading.title': 'Загружаем обновление',
+  'updater.downloading.subtitle': '{got} / {total} МБ · {speed} МБ/с',
+  'updater.downloaded.title': 'Готово · v{v}',
+  'updater.downloaded.subtitle': 'Перезапусти для применения',
+  'updater.error.title': 'Ошибка проверки',
+  'updater.idle.title': 'Проверить обновления',
+  'updater.idle.subtitle': 'Авто-проверка раз в час',
+
+  // Reminder window
+  'reminder.kicker': 'Время тренировки',
+  'reminder.subkicker': 'Двигайся',
+  'reminder.reps': 'раз',
+  'reminder.next_in': 'Следующее через {interval}',
+  'reminder.btn.done': 'Готово',
+  'match.title.won': 'Победа',
+  'match.title.lost': 'Поражение',
+  'match.title.draw': 'Матч завершён',
+  'match.summary.minutes_count': '{n} мин',
+  'match.summary.challenges_one': '{n} челлендж',
+  'match.summary.challenges_few': '{n} челленджа',
+  'match.summary.challenges_many': '{n} челленджей',
+  'match.summary.all_done': 'всё готово',
+  'match.summary.remaining': '{n} осталось',
+  'match.total': 'Всего',
+  'match.total_reps_suffix': 'повторов',
+
+  // Format helpers
+  'fmt.now': 'сейчас',
+  'fmt.h': 'ч',
+  'fmt.m': 'мин',
+  'fmt.h_short': 'ч',
+  'fmt.m_short': 'м',
+  'fmt.s_short': 'с',
+  'fmt.paused': 'на паузе',
+  'fmt.through': 'Через'
+}
+
+export const en: Dict = {
+  // Sidebar / nav
+  'nav.today': 'Today',
+  'nav.exercises': 'Exercises',
+  'nav.games': 'Games',
+  'nav.challenges': 'Challenges',
+  'nav.settings': 'Settings',
+  'sidebar.slogan': 'Move with intention',
+  'sidebar.status_tracking': 'Activity tracking is on',
+  'titlebar.menu_aria': 'Menu',
+  'titlebar.minimize_aria': 'Minimize',
+  'titlebar.tray_aria': 'To tray',
+  'titlebar.close_aria': 'Close',
+  'titlebar.app_title': 'Exercise Reminder',
+
+  // Common buttons
+  'btn.add': 'Add',
+  'btn.new': 'New',
+  'btn.cancel': 'Cancel',
+  'btn.save': 'Save',
+  'btn.done': 'Done',
+  'btn.start': 'Start',
+  'btn.pause': 'Pause',
+  'btn.refresh': 'Refresh',
+  'btn.edit': 'Edit',
+  'btn.delete': 'Delete',
+  'btn.snooze_min': 'Snooze {n}m',
+  'btn.skip': 'Skip',
+  'btn.close': 'Close',
+  'btn.later': 'Later',
+  'btn.connect': 'Connect',
+  'btn.disconnect': 'Disconnect',
+  'btn.check': 'Check',
+  'btn.download': 'Download',
+  'btn.restart': 'Restart',
+  'btn.retry': 'Retry',
+
+  // Dashboard
+  'dashboard.kicker': 'Daily training',
+  'dashboard.title': 'Today',
+  'dashboard.stat.active': 'Active',
+  'dashboard.stat.active.of': 'of {total}',
+  'dashboard.stat.next': 'Next in',
+  'dashboard.stat.next.now': 'Now',
+  'dashboard.stat.next.subtitle_paused': 'paused',
+  'dashboard.stat.next.subtitle_running': 'counting down',
+  'dashboard.stat.tracking': 'Match tracking',
+  'dashboard.stat.tracking.on': 'On',
+  'dashboard.stat.tracking.off': 'Off',
+  'dashboard.stat.tracking.subtitle_on': 'real-time',
+  'dashboard.stat.tracking.subtitle_off': 'disabled',
+  'dashboard.paused.title': 'Reminders paused',
+  'dashboard.paused.hint': 'Resume to continue countdown',
+  'dashboard.empty.title': 'Program is empty',
+  'dashboard.empty.hint': 'Add your first exercise to start',
+
+  // Exercises
+  'exercises.kicker': 'Program',
+  'exercises.title': 'Exercises',
+  'exercises.section.active': 'Active · {n}',
+  'exercises.section.disabled': 'Disabled · {n}',
+  'exercises.row.meta': '{reps} reps · {interval}',
+  'exercises.empty': 'Program is empty — add your first exercise',
+
+  // Exercise editor
+  'editor.exercise.title.new': 'New exercise',
+  'editor.exercise.title.edit': 'Edit',
+  'editor.exercise.preview.placeholder': 'Untitled',
+  'editor.exercise.preview.meta': '{reps} reps · every {min} min',
+  'editor.field.name': 'Name',
+  'editor.field.name.placeholder': 'Squats',
+  'editor.field.reps': 'Reps',
+  'editor.field.interval_min': 'Interval (min)',
+  'editor.field.icon': 'Icon',
+
+  // Challenges
+  'challenges.kicker': 'Per-match rules',
+  'challenges.title': 'Challenges',
+  'challenges.subtitle': 'Reps = {formula}',
+  'challenges.subtitle.formula': 'stat × multiplier',
+  'challenges.warning.no_games':
+    'Challenges trigger after a match. Connect a game in the Games tab.',
+  'challenges.section.all': 'All · {n}',
+  'challenges.empty':
+    'No challenges yet. Tie an exercise to a match statistic.',
+
+  // Challenge editor
+  'editor.challenge.title.new': 'New challenge',
+  'editor.challenge.title.edit': 'Edit',
+  'editor.field.challenge_name': 'Name',
+  'editor.field.challenge_name.placeholder': 'Squats per death',
+  'editor.field.game': 'Game',
+  'editor.field.stat': 'Statistic',
+  'editor.field.multiplier': 'Multiplier',
+  'editor.field.exercise_name': 'Exercise',
+  'editor.field.exercise_name.placeholder': 'Squats',
+  'editor.challenge.preview.kicker': 'Preview · 5 events',
+  'editor.challenge.preview.fallback': 'reps',
+
+  // Games
+  'games.kicker': 'Match tracking',
+  'games.title': 'Games',
+  'games.subtitle': 'Connect a game — challenges fire right after the match',
+  'games.subtitle.live': '{n} live',
+  'games.section.supported': 'Supported',
+  'games.scanning': 'Scanning installed games…',
+  'games.queued.body':
+    'Steam is running. The {opt} option will be added automatically next time Steam closes.',
+  'games.no_user.body':
+    'No logged-in Steam account (no userdata folder). Launch Steam once, then click “Connect”.',
+  'games.not_installed.hint': 'Install the game in Steam and click Refresh',
+  'games.dev.toggle': 'dev · simulate match end',
+  'games.badge.live': 'Live',
+  'games.badge.ready': 'Ready',
+  'games.badge.queued': 'Queued',
+  'games.badge.installed': 'Installed',
+  'games.badge.not_found': 'Not found',
+
+  // Settings
+  'settings.kicker': 'Configuration',
+  'settings.title': 'Settings',
+  'settings.section.reminders': 'Reminders',
+  'settings.section.window': 'Window & tray',
+  'settings.section.appearance': 'Appearance',
+  'settings.section.language': 'Language',
+  'settings.section.updates': 'Updates',
+  'settings.notification_mode.label': 'Notification mode',
+  'settings.notification_mode.hint': 'How a reminder appears',
+  'settings.notification_mode.modal': 'Window on top',
+  'settings.notification_mode.toast': 'System notification',
+  'settings.notification_mode.both': 'Window and notification',
+  'settings.sound.label': 'Notification sound',
+  'settings.sound.hint': 'Short beep on trigger',
+  'settings.snooze.label': '“Snooze” for',
+  'settings.snooze.hint': 'How many minutes to postpone',
+  'settings.snooze.1': '1 minute',
+  'settings.snooze.5': '5 minutes',
+  'settings.snooze.10': '10 minutes',
+  'settings.snooze.15': '15 minutes',
+  'settings.snooze.30': '30 minutes',
+  'settings.tray.label': 'Minimize to tray',
+  'settings.tray.hint': 'Keep running in background when closed',
+  'settings.autostart.label': 'Start with Windows',
+  'settings.autostart.hint': 'Open at system login',
+  'settings.start_minimized.label': 'Start minimized',
+  'settings.start_minimized.hint': 'On autostart open straight to tray',
+  'settings.theme.label': 'Theme',
+  'settings.theme.hint': 'Light / dark / follow system',
+  'settings.theme.system': 'System',
+  'settings.theme.light': 'Light',
+  'settings.theme.dark': 'Dark',
+  'settings.language.label': 'Interface language',
+  'settings.language.hint': 'Applied immediately',
+  'settings.language.ru': 'Русский',
+  'settings.language.en': 'English',
+  'settings.loading': 'Loading…',
+
+  // Updater
+  'updater.unsupported': 'Auto-update unavailable',
+  'updater.unsupported.reason_dev': 'Auto-update is disabled in dev mode',
+  'updater.checking': 'Checking for updates…',
+  'updater.up_to_date': 'Up to date',
+  'updater.up_to_date.subtitle': 'Current: v{v}',
+  'updater.available.title': 'v{v} available',
+  'updater.downloading.title': 'Downloading update',
+  'updater.downloading.subtitle': '{got} / {total} MB · {speed} MB/s',
+  'updater.downloaded.title': 'Ready · v{v}',
+  'updater.downloaded.subtitle': 'Restart to apply',
+  'updater.error.title': 'Check failed',
+  'updater.idle.title': 'Check for updates',
+  'updater.idle.subtitle': 'Auto-check every hour',
+
+  // Reminder window
+  'reminder.kicker': 'Workout time',
+  'reminder.subkicker': 'Move',
+  'reminder.reps': 'reps',
+  'reminder.next_in': 'Next in {interval}',
+  'reminder.btn.done': 'Done',
+  'match.title.won': 'Victory',
+  'match.title.lost': 'Defeat',
+  'match.title.draw': 'Match finished',
+  'match.summary.minutes_count': '{n} min',
+  'match.summary.challenges_one': '{n} challenge',
+  'match.summary.challenges_few': '{n} challenges',
+  'match.summary.challenges_many': '{n} challenges',
+  'match.summary.all_done': 'all done',
+  'match.summary.remaining': '{n} left',
+  'match.total': 'Total',
+  'match.total_reps_suffix': 'reps',
+
+  // Format helpers
+  'fmt.now': 'now',
+  'fmt.h': 'h',
+  'fmt.m': 'min',
+  'fmt.h_short': 'h',
+  'fmt.m_short': 'm',
+  'fmt.s_short': 's',
+  'fmt.paused': 'paused',
+  'fmt.through': 'In'
+}

src/renderer/src/i18n/i18n.test.ts

@@ -0,0 +1,97 @@
+import { describe, expect, it } from 'vitest'
+import { translate, translateN } from './index'
+
+describe('translate', () => {
+  it('returns the matching string by key', () => {
+    expect(translate('ru', 'btn.save')).toBe('Сохранить')
+    expect(translate('en', 'btn.save')).toBe('Save')
+  })
+
+  it('falls back to the key when missing', () => {
+    expect(translate('ru', 'totally.unknown.key')).toBe('totally.unknown.key')
+  })
+
+  it('substitutes single variable', () => {
+    expect(translate('ru', 'btn.snooze_min', { n: 5 })).toBe('Отложить 5 мин')
+    expect(translate('en', 'btn.snooze_min', { n: 10 })).toBe('Snooze 10m')
+  })
+
+  it('substitutes multiple variables', () => {
+    expect(
+      translate('en', 'updater.downloading.subtitle', {
+        got: '1.5',
+        total: '80.0',
+        speed: '2.5'
+      })
+    ).toBe('1.5 / 80.0 MB · 2.5 MB/s')
+  })
+
+  it('handles unknown language with fallback to ru', () => {
+    // @ts-expect-error testing fallback
+    expect(translate('fr', 'btn.save')).toBe('Сохранить')
+  })
+})
+
+describe('translateN (plural)', () => {
+  describe('russian plural rules', () => {
+    it('one: 1, 21, 101', () => {
+      expect(translateN('ru', 'match.summary.challenges', 1)).toBe('1 челлендж')
+      expect(translateN('ru', 'match.summary.challenges', 21)).toBe(
+        '21 челлендж'
+      )
+      expect(translateN('ru', 'match.summary.challenges', 101)).toBe(
+        '101 челлендж'
+      )
+    })
+
+    it('few: 2, 3, 4, 22, 23, 24', () => {
+      expect(translateN('ru', 'match.summary.challenges', 2)).toBe(
+        '2 челленджа'
+      )
+      expect(translateN('ru', 'match.summary.challenges', 3)).toBe(
+        '3 челленджа'
+      )
+      expect(translateN('ru', 'match.summary.challenges', 22)).toBe(
+        '22 челленджа'
+      )
+    })
+
+    it('many: 0, 5-20, 25-30, 111-114', () => {
+      expect(translateN('ru', 'match.summary.challenges', 0)).toBe(
+        '0 челленджей'
+      )
+      expect(translateN('ru', 'match.summary.challenges', 5)).toBe(
+        '5 челленджей'
+      )
+      expect(translateN('ru', 'match.summary.challenges', 11)).toBe(
+        '11 челленджей'
+      )
+      expect(translateN('ru', 'match.summary.challenges', 13)).toBe(
+        '13 челленджей'
+      )
+      expect(translateN('ru', 'match.summary.challenges', 20)).toBe(
+        '20 челленджей'
+      )
+    })
+  })
+
+  describe('english plural rules', () => {
+    it('one for 1', () => {
+      expect(translateN('en', 'match.summary.challenges', 1)).toBe(
+        '1 challenge'
+      )
+    })
+
+    it('many/other for anything else', () => {
+      expect(translateN('en', 'match.summary.challenges', 0)).toBe(
+        '0 challenges'
+      )
+      expect(translateN('en', 'match.summary.challenges', 2)).toBe(
+        '2 challenges'
+      )
+      expect(translateN('en', 'match.summary.challenges', 21)).toBe(
+        '21 challenges'
+      )
+    })
+  })
+})

src/renderer/src/i18n/index.ts

@@ -0,0 +1,83 @@
+import { useAppStore } from '../store/appStore'
+import { ru, en, type Dict } from './dict'
+import type { Language } from '@shared/types'
+
+const dicts: Record<Language, Dict> = { ru, en }
+
+export function getDict(lang: Language): Dict {
+  return dicts[lang] ?? ru
+}
+
+export type TVars = Record<string, string | number>
+
+/**
+ * Look up a key in the dictionary, substitute `{var}` placeholders.
+ * Returns the key itself if not found — surfaces missing translations.
+ */
+export function translate(
+  lang: Language,
+  key: string,
+  vars?: TVars
+): string {
+  const dict = getDict(lang)
+  let s = dict[key] ?? key
+  if (vars) {
+    for (const k of Object.keys(vars)) {
+      s = s.replace(new RegExp(`\\{${k}\\}`, 'g'), String(vars[k]))
+    }
+  }
+  return s
+}
+
+/**
+ * Russian CLDR plural categories — covers nominal forms.
+ *  one  → 1, 21, 31, 41…  (но не 11)
+ *  few  → 2-4, 22-24…     (но не 12-14)
+ *  many → 0, 5-20, 25-30…
+ */
+function pluralRu(n: number): 'one' | 'few' | 'many' {
+  const mod10 = n % 10
+  const mod100 = n % 100
+  if (mod10 === 1 && mod100 !== 11) return 'one'
+  if (mod10 >= 2 && mod10 <= 4 && (mod100 < 10 || mod100 >= 20)) return 'few'
+  return 'many'
+}
+
+/**
+ * Plural lookup. Pass `keyBase` like `match.summary.challenges` — the
+ * function appends `_one`/`_few`/`_many` (ru) or `_one`/`_many` (en).
+ * The `n` value is exposed as `{n}` in the resulting string.
+ */
+export function translateN(
+  lang: Language,
+  keyBase: string,
+  n: number,
+  vars?: TVars
+): string {
+  const form =
+    lang === 'ru'
+      ? pluralRu(n)
+      : n === 1
+        ? 'one'
+        : 'many'
+  return translate(lang, `${keyBase}_${form}`, { n, ...vars })
+}
+
+/* ---------------- React hook ---------------- */
+
+export function useLang(): Language {
+  return useAppStore((s) => s.state?.settings?.language ?? 'ru')
+}
+
+export function useT(): {
+  t: (key: string, vars?: TVars) => string
+  tn: (keyBase: string, n: number, vars?: TVars) => string
+  lang: Language
+} {
+  const lang = useLang()
+  return {
+    t: (key, vars) => translate(lang, key, vars),
+    tn: (keyBase, n, vars) => translateN(lang, keyBase, n, vars),
+    lang
+  }
+}

src/renderer/src/lib/format.ts

@@ -1,17 +1,29 @@
-export function formatCountdown(ms: number): string {
-  if (ms <= 0) return 'сейчас'
+import type { Language } from '@shared/types'
+
+const SUFFIX = {
+  ru: { now: 'сейчас', h: 'ч', m: 'м', s: 'с', minLong: 'мин', hLong: 'ч' },
+  en: { now: 'now', h: 'h', m: 'm', s: 's', minLong: 'min', hLong: 'h' }
+}
+
+export function formatCountdown(ms: number, lang: Language = 'ru'): string {
+  const s = SUFFIX[lang] ?? SUFFIX.ru
+  if (ms <= 0) return s.now
   const totalSec = Math.floor(ms / 1000)
   const h = Math.floor(totalSec / 3600)
   const m = Math.floor((totalSec % 3600) / 60)
-  const s = totalSec % 60
-  if (h > 0) return `${h}ч ${String(m).padStart(2, '0')}м`
-  if (m > 0) return `${m}м ${String(s).padStart(2, '0')}с`
-  return `${s}с`
+  const sec = totalSec % 60
+  if (h > 0) return `${h}${s.h} ${String(m).padStart(2, '0')}${s.m}`
+  if (m > 0) return `${m}${s.m} ${String(sec).padStart(2, '0')}${s.s}`
+  return `${sec}${s.s}`
 }
 
-export function formatInterval(minutes: number): string {
-  if (minutes < 60) return `${minutes} мин`
+export function formatInterval(
+  minutes: number,
+  lang: Language = 'ru'
+): string {
+  const s = SUFFIX[lang] ?? SUFFIX.ru
+  if (minutes < 60) return `${minutes} ${s.minLong}`
   const h = Math.floor(minutes / 60)
   const m = minutes % 60
-  return m === 0 ? `${h} ч` : `${h} ч ${m} мин`
+  return m === 0 ? `${h} ${s.hLong}` : `${h} ${s.hLong} ${m} ${s.minLong}`
 }

src/renderer/src/pages/Challenges.tsx

@@ -6,13 +6,15 @@ import { Switch } from '../components/ui/Switch'
 import { Modal } from '../components/ui/Modal'
 import { Card, Row, SectionHeader } from '../components/ui/Card'
 import { ICON_CHOICES, Icon } from '../lib/icon'
-import { GAME_STATS, STAT_LABELS } from '@shared/types'
+import { GAME_STATS, statLabel } from '@shared/types'
 import type {
   Challenge,
   GameId,
   GameStat,
-  GameStatus
+  GameStatus,
+  Language
 } from '@shared/types'
+import { useT } from '../i18n'
 
 const GAME_NAMES: Record<GameId, string> = {
   dota2: 'Dota 2'
@@ -35,6 +37,7 @@ export default function ChallengesPage(): JSX.Element {
   const [games, setGames] = useState<GameStatus[]>([])
   const [editorOpen, setEditorOpen] = useState(false)
   const [editing, setEditing] = useState<Challenge | null>(null)
+  const { t, lang } = useT()
 
   useEffect(() => {
     void window.api.listGames().then(setGames)
@@ -49,13 +52,15 @@ export default function ChallengesPage(): JSX.Element {
         <div className="flex flex-col sm:flex-row sm:items-end sm:justify-between gap-4 mb-8">
           <div>
             <div className="text-[14px] text-text/65 font-semibold">
-              Правила за матч
+              {t('challenges.kicker')}
             </div>
             <h1 className="font-serif text-[34px] sm:text-[40px] leading-[1.02] tracking-tight mt-1 font-bold">
-              Челленджи
+              {t('challenges.title')}
             </h1>
             <p className="text-[15px] text-text/65 mt-2 font-medium">
-              Повторов = <span className="font-mono-num font-semibold text-text">статистика × коэффициент</span>
+              {t('challenges.subtitle', {
+                formula: t('challenges.subtitle.formula')
+              })}
             </p>
           </div>
           <Button
@@ -64,7 +69,7 @@ export default function ChallengesPage(): JSX.Element {
               setEditorOpen(true)
             }}
           >
-            <Plus size={15} strokeWidth={2.5} /> Новый
+            <Plus size={15} strokeWidth={2.5} /> {t('btn.new')}
           </Button>
         </div>
 
@@ -74,15 +79,16 @@ export default function ChallengesPage(): JSX.Element {
               <AlertTriangle size={18} strokeWidth={2.5} />
             </div>
             <div className="text-[14px] text-text/85 leading-relaxed font-medium">
-              Челленджи срабатывают после матча. Подключи игру во вкладке{' '}
-              <span className="font-semibold text-text">«Игры»</span>.
+              {t('challenges.warning.no_games')}
             </div>
           </div>
         )}
 
         {challenges.length > 0 ? (
           <>
-            <SectionHeader title={`Все · ${challenges.length}`} />
+            <SectionHeader
+              title={t('challenges.section.all', { n: challenges.length })}
+            />
             <Card>
               {challenges.map((c, i) => (
                 <Row
@@ -111,7 +117,7 @@ export default function ChallengesPage(): JSX.Element {
                       <Gamepad2 size={12} strokeWidth={2.4} />
                       {GAME_NAMES[c.gameId]} ·{' '}
                       <span className="font-mono-num font-semibold text-text">
-                        {STAT_LABELS[c.stat]} × {c.multiplier}
+                        {statLabel(c.stat, lang)} × {c.multiplier}
                       </span>{' '}
                       → {c.exerciseName}
                     </div>
@@ -129,8 +135,8 @@ export default function ChallengesPage(): JSX.Element {
           </>
         ) : (
           <Card>
-            <div className="px-5 py-12 text-center text-text/55 text-[14px]">
-              Челленджей пока нет. Привяжи упражнение к статистике матча.
+            <div className="px-5 py-12 text-center text-text/65 text-[15px] font-medium">
+              {t('challenges.empty')}
             </div>
           </Card>
         )}
@@ -138,6 +144,7 @@ export default function ChallengesPage(): JSX.Element {
         <ChallengeEditor
           open={editorOpen}
           challenge={editing}
+          lang={lang}
           onClose={() => setEditorOpen(false)}
           onSave={async (draft) => {
             if (editing) await window.api.updateChallenge(editing.id, draft)
@@ -153,15 +160,18 @@ export default function ChallengesPage(): JSX.Element {
 function ChallengeEditor({
   open,
   challenge,
+  lang,
   onClose,
   onSave
 }: {
   open: boolean
   challenge: Challenge | null
+  lang: Language
   onClose: () => void
   onSave: (draft: Draft) => void
 }): JSX.Element {
   const [draft, setDraft] = useState<Draft>(EMPTY_DRAFT)
+  const { t } = useT()
 
   useEffect(() => {
     if (challenge) {
@@ -190,30 +200,34 @@ function ChallengeEditor({
     <Modal
       open={open}
       onClose={onClose}
-      title={challenge ? 'Редактировать' : 'Новый челлендж'}
+      title={
+        challenge
+          ? t('editor.challenge.title.edit')
+          : t('editor.challenge.title.new')
+      }
       footer={
         <>
           <Button variant="plain" onClick={onClose}>
-            Отмена
+            {t('btn.cancel')}
           </Button>
           <Button disabled={!canSave} onClick={() => onSave(draft)}>
-            Сохранить
+            {t('btn.save')}
           </Button>
         </>
       }
     >
       <div className="space-y-5">
-        <Field label="Название">
+        <Field label={t('editor.field.challenge_name')}>
           <input
             value={draft.name}
             onChange={(e) => setDraft({ ...draft, name: e.target.value })}
-            placeholder="За смерти — приседания"
+            placeholder={t('editor.field.challenge_name.placeholder')}
             className="ios-input"
             autoFocus
           />
         </Field>
 
-        <Field label="Игра">
+        <Field label={t('editor.field.game')}>
           <select
             value={draft.gameId}
             onChange={(e) =>
@@ -230,7 +244,7 @@ function ChallengeEditor({
         </Field>
 
         <div className="grid grid-cols-2 gap-3">
-          <Field label="Статистика">
+          <Field label={t('editor.field.stat')}>
             <select
               value={draft.stat}
               onChange={(e) =>
@@ -240,12 +254,12 @@ function ChallengeEditor({
             >
               {GAME_STATS[draft.gameId].map((s) => (
                 <option key={s} value={s}>
-                  {STAT_LABELS[s]}
+                  {statLabel(s, lang)}
                 </option>
               ))}
             </select>
           </Field>
-          <Field label="Коэффициент">
+          <Field label={t('editor.field.multiplier')}>
             <input
               type="number"
               step="0.5"
@@ -262,18 +276,18 @@ function ChallengeEditor({
           </Field>
         </div>
 
-        <Field label="Упражнение">
+        <Field label={t('editor.field.exercise_name')}>
           <input
             value={draft.exerciseName}
             onChange={(e) =>
               setDraft({ ...draft, exerciseName: e.target.value })
             }
-            placeholder="Приседания"
+            placeholder={t('editor.field.exercise_name.placeholder')}
             className="ios-input"
           />
         </Field>
 
-        <Field label="Иконка">
+        <Field label={t('editor.field.icon')}>
           <div className="grid grid-cols-8 gap-2 max-h-44 overflow-y-auto p-2 rounded-2xl bg-surface-2">
             {ICON_CHOICES.map((name) => (
               <button
@@ -293,13 +307,12 @@ function ChallengeEditor({
           </div>
         </Field>
 
-        {/* Live preview */}
         <div className="rounded-2xl bg-accent/8 p-4">
           <div className="text-[11px] uppercase tracking-wider text-accent font-semibold mb-2">
-            Превью · 5 событий
+            {t('editor.challenge.preview.kicker')}
           </div>
           <div className="font-mono-num text-[14px] text-text/75 flex items-baseline gap-1.5 flex-wrap">
-            <span>5 {STAT_LABELS[draft.stat]}</span>
+            <span>5 {statLabel(draft.stat, lang)}</span>
             <span className="text-text/40">×</span>
             <span>{draft.multiplier}</span>
             <span className="text-text/40">=</span>
@@ -307,12 +320,12 @@ function ChallengeEditor({
               {previewReps}
             </span>
             <span className="text-text/55">
-              {draft.exerciseName.toLowerCase() || 'повторов'}
+              {draft.exerciseName.toLowerCase() ||
+                t('editor.challenge.preview.fallback')}
             </span>
           </div>
         </div>
       </div>
-
       <style>{`
         .ios-input {
           width: 100%;

src/renderer/src/pages/Dashboard.tsx

@@ -7,12 +7,14 @@ import { ExerciseEditor } from '../components/ExerciseEditor'
 import { Button } from '../components/ui/Button'
 import type { Exercise } from '@shared/types'
 import { formatCountdown } from '../lib/format'
+import { useT } from '../i18n'
 
 export default function Dashboard(): JSX.Element {
   const state = useAppStore((s) => s.state)
   const ticks = useAppStore((s) => s.ticks)
   const [editorOpen, setEditorOpen] = useState(false)
   const [editing, setEditing] = useState<Exercise | null>(null)
+  const { t, lang } = useT()
 
   const exercises = state?.exercises ?? []
   const settings = state?.settings
@@ -57,70 +59,79 @@ export default function Dashboard(): JSX.Element {
     await window.api.updateSettings({ globalEnabled: !settings.globalEnabled })
   }
 
-  const today = new Date().toLocaleDateString('ru-RU', {
-    weekday: 'long',
-    day: 'numeric',
-    month: 'long'
-  })
+  const today = new Date().toLocaleDateString(
+    lang === 'en' ? 'en-US' : 'ru-RU',
+    { weekday: 'long', day: 'numeric', month: 'long' }
+  )
 
   return (
     <div className="h-full overflow-y-auto">
       <div className="max-w-5xl mx-auto px-4 sm:px-6 lg:px-10 pt-8 pb-12">
-        {/* Hero — iOS Large Title */}
         <div className="flex flex-col sm:flex-row sm:items-end sm:justify-between gap-4 mb-8">
           <div className="min-w-0">
             <div className="text-[14px] text-text/65 font-semibold capitalize">
               {today}
             </div>
             <h1 className="font-serif text-[34px] sm:text-[40px] leading-[1.02] tracking-tight mt-1 font-bold">
-              Сегодня
+              {t('dashboard.title')}
             </h1>
           </div>
           <div className="flex items-center gap-2">
             <Button variant="tinted" onClick={togglePause}>
               {!paused ? (
                 <>
-                  <Pause size={14} strokeWidth={2.5} /> Пауза
+                  <Pause size={14} strokeWidth={2.5} /> {t('btn.pause')}
                 </>
               ) : (
                 <>
-                  <Play size={14} strokeWidth={2.5} /> Старт
+                  <Play size={14} strokeWidth={2.5} /> {t('btn.start')}
                 </>
               )}
             </Button>
             <Button onClick={openCreate}>
-              <Plus size={15} strokeWidth={2.5} /> Добавить
+              <Plus size={15} strokeWidth={2.5} /> {t('btn.add')}
             </Button>
           </div>
         </div>
 
-        {/* Hero stat panel — Apple Fitness style */}
         <div className="grid grid-cols-1 sm:grid-cols-3 gap-3 mb-8">
           <HeroStat
             tone="accent"
-            label="Активных"
+            label={t('dashboard.stat.active')}
             value={`${stats.active}`}
-            subvalue={`из ${stats.total}`}
+            subvalue={t('dashboard.stat.active.of', { total: stats.total })}
             icon={<Activity size={14} strokeWidth={2.6} />}
           />
           <HeroStat
             tone="info"
-            label="До следующего"
+            label={t('dashboard.stat.next')}
             value={
               stats.nextMs === Infinity
                 ? '—'
                 : stats.nextMs <= 0
-                  ? 'Сейчас'
-                  : formatCountdown(stats.nextMs)
+                  ? t('dashboard.stat.next.now')
+                  : formatCountdown(stats.nextMs, lang)
+            }
+            subvalue={
+              paused
+                ? t('dashboard.stat.next.subtitle_paused')
+                : t('dashboard.stat.next.subtitle_running')
             }
-            subvalue={paused ? 'на паузе' : 'отсчёт идёт'}
             icon={<Flame size={14} strokeWidth={2.6} />}
           />
           <HeroStat
             tone={gamesEnabled ? 'success' : 'muted'}
-            label="Трекинг матчей"
-            value={gamesEnabled ? 'On' : 'Off'}
-            subvalue={gamesEnabled ? 'в реальном времени' : 'выключен'}
+            label={t('dashboard.stat.tracking')}
+            value={
+              gamesEnabled
+                ? t('dashboard.stat.tracking.on')
+                : t('dashboard.stat.tracking.off')
+            }
+            subvalue={
+              gamesEnabled
+                ? t('dashboard.stat.tracking.subtitle_on')
+                : t('dashboard.stat.tracking.subtitle_off')
+            }
             icon={
               <span
                 className={[
@@ -132,7 +143,6 @@ export default function Dashboard(): JSX.Element {
           />
         </div>
 
-        {/* Paused banner */}
         {paused && (
           <motion.div
             initial={{ opacity: 0, y: -4 }}
@@ -144,19 +154,18 @@ export default function Dashboard(): JSX.Element {
             </div>
             <div className="flex-1 min-w-0">
               <div className="text-[16px] font-semibold leading-tight">
-                Напоминания на паузе
+                {t('dashboard.paused.title')}
               </div>
               <div className="text-[14px] text-text/70 mt-1">
-                Возобнови, чтобы продолжить отсчёт
+                {t('dashboard.paused.hint')}
               </div>
             </div>
             <Button variant="filled" size="sm" onClick={togglePause}>
-              <Play size={14} strokeWidth={2.5} /> Старт
+              <Play size={14} strokeWidth={2.5} /> {t('btn.start')}
             </Button>
           </motion.div>
         )}
 
-        {/* Cards grid */}
         <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-2 gap-4">
           <AnimatePresence>
             {exercises.map((ex) => (
@@ -179,10 +188,10 @@ export default function Dashboard(): JSX.Element {
               <Plus size={24} strokeWidth={2.5} />
             </div>
             <div className="font-display text-[20px] font-semibold">
-              Программа пуста
+              {t('dashboard.empty.title')}
             </div>
             <p className="text-[14px] text-text/55 mt-1">
-              Добавь первое упражнение, чтобы начать
+              {t('dashboard.empty.hint')}
             </p>
           </div>
         )}

src/renderer/src/pages/Exercises.tsx

@@ -7,12 +7,14 @@ import { Switch } from '../components/ui/Switch'
 import { Card, Row, SectionHeader } from '../components/ui/Card'
 import { Icon } from '../lib/icon'
 import { formatInterval } from '../lib/format'
+import { useT } from '../i18n'
 import type { Exercise } from '@shared/types'
 
 export default function Exercises(): JSX.Element {
   const exercises = useAppStore((s) => s.state?.exercises ?? [])
   const [editorOpen, setEditorOpen] = useState(false)
   const [editing, setEditing] = useState<Exercise | null>(null)
+  const { t, lang } = useT()
 
   const enabled = exercises.filter((e) => e.enabled)
   const disabled = exercises.filter((e) => !e.enabled)
@@ -23,10 +25,10 @@ export default function Exercises(): JSX.Element {
         <div className="flex flex-col sm:flex-row sm:items-end sm:justify-between gap-4 mb-8">
           <div>
             <div className="text-[14px] text-text/65 font-semibold">
-              Программа
+              {t('exercises.kicker')}
             </div>
             <h1 className="font-serif text-[34px] sm:text-[40px] leading-[1.02] tracking-tight mt-1 font-bold">
-              Упражнения
+              {t('exercises.title')}
             </h1>
           </div>
           <Button
@@ -35,19 +37,25 @@ export default function Exercises(): JSX.Element {
               setEditorOpen(true)
             }}
           >
-            <Plus size={15} strokeWidth={2.5} /> Добавить
+            <Plus size={15} strokeWidth={2.5} /> {t('btn.add')}
           </Button>
         </div>
 
         {enabled.length > 0 && (
           <>
-            <SectionHeader title={`Активные · ${enabled.length}`} />
+            <SectionHeader
+              title={t('exercises.section.active', { n: enabled.length })}
+            />
             <Card className="mb-6">
               {enabled.map((ex, i) => (
                 <ExerciseRow
                   key={ex.id}
                   exercise={ex}
                   last={i === enabled.length - 1}
+                  meta={t('exercises.row.meta', {
+                    reps: ex.reps,
+                    interval: formatInterval(ex.intervalMinutes, lang)
+                  })}
                   onEdit={() => {
                     setEditing(ex)
                     setEditorOpen(true)
@@ -60,13 +68,19 @@ export default function Exercises(): JSX.Element {
 
         {disabled.length > 0 && (
           <>
-            <SectionHeader title={`Выключенные · ${disabled.length}`} />
+            <SectionHeader
+              title={t('exercises.section.disabled', { n: disabled.length })}
+            />
             <Card>
               {disabled.map((ex, i) => (
                 <ExerciseRow
                   key={ex.id}
                   exercise={ex}
                   last={i === disabled.length - 1}
+                  meta={t('exercises.row.meta', {
+                    reps: ex.reps,
+                    interval: formatInterval(ex.intervalMinutes, lang)
+                  })}
                   onEdit={() => {
                     setEditing(ex)
                     setEditorOpen(true)
@@ -80,7 +94,7 @@ export default function Exercises(): JSX.Element {
         {exercises.length === 0 && (
           <Card>
             <div className="px-5 py-12 text-center text-text/65 text-[15px] font-medium">
-              Программа пуста — добавь первое упражнение
+              {t('exercises.empty')}
             </div>
           </Card>
         )}
@@ -103,15 +117,16 @@ export default function Exercises(): JSX.Element {
 function ExerciseRow({
   exercise,
   last,
+  meta,
   onEdit
 }: {
   exercise: Exercise
   last: boolean
+  meta: string
   onEdit: () => void
 }): JSX.Element {
   return (
     <Row last={last}>
-      {/* Tinted icon plaque, iOS Settings style */}
       <div
         className={[
           'w-9 h-9 rounded-lg grid place-items-center shrink-0',
@@ -129,19 +144,15 @@ function ExerciseRow({
         <div className="text-[16px] font-semibold truncate leading-tight">
           {exercise.name}
         </div>
-        <div className="text-[14px] text-text/65 mt-1 font-medium">
-          {exercise.reps} раз · {formatInterval(exercise.intervalMinutes)}
-        </div>
+        <div className="text-[14px] text-text/65 mt-1 font-medium">{meta}</div>
       </button>
       <Switch
         checked={exercise.enabled}
         onChange={(v) => window.api.toggleExercise(exercise.id, v)}
-        aria-label="Включить/выключить"
       />
       <button
         onClick={onEdit}
         className="text-text/30 hover:text-text/60 transition-colors"
-        aria-label="Редактировать"
       >
         <ChevronRight size={16} />
       </button>

src/renderer/src/pages/Games.tsx

@@ -13,10 +13,12 @@ import { Button } from '../components/ui/Button'
 import { Switch } from '../components/ui/Switch'
 import { Card, SectionHeader } from '../components/ui/Card'
 import type { GameId, GameStatus } from '@shared/types'
+import { useT } from '../i18n'
 
 export default function GamesPage(): JSX.Element {
   const [games, setGames] = useState<GameStatus[]>([])
   const [busy, setBusy] = useState<GameId | null>(null)
+  const { t } = useT()
 
   useEffect(() => {
     void refresh()
@@ -62,29 +64,29 @@ export default function GamesPage(): JSX.Element {
         <div className="flex flex-col sm:flex-row sm:items-end sm:justify-between gap-4 mb-8">
           <div>
             <div className="text-[14px] text-text/65 font-semibold">
-              Трекинг матчей
+              {t('games.kicker')}
             </div>
             <h1 className="font-serif text-[34px] sm:text-[40px] leading-[1.02] tracking-tight mt-1 font-bold">
-              Игры
+              {t('games.title')}
             </h1>
             <p className="text-[15px] text-text/65 mt-2 font-medium leading-relaxed">
-              Подключи игру — челленджи сработают сразу после матча
+              {t('games.subtitle')}
               {liveCount > 0 && (
                 <>
                   {' · '}
                   <span className="text-success font-mono-num font-bold">
-                    {liveCount} live
+                    {t('games.subtitle.live', { n: liveCount })}
                   </span>
                 </>
               )}
             </p>
           </div>
           <Button variant="tinted" onClick={refresh}>
-            <RefreshCw size={14} strokeWidth={2.5} /> Обновить
+            <RefreshCw size={14} strokeWidth={2.5} /> {t('btn.refresh')}
           </Button>
         </div>
 
-        <SectionHeader title="Поддерживаемые" />
+        <SectionHeader title={t('games.section.supported')} />
         <div className="space-y-4">
           {games.map((g, i) => (
             <motion.div
@@ -105,7 +107,7 @@ export default function GamesPage(): JSX.Element {
           {games.length === 0 && (
             <Card>
               <div className="px-5 py-12 text-center text-text/55 text-[14px]">
-                Сканируем установленные игры…
+                {t('games.scanning')}
               </div>
             </Card>
           )}
@@ -130,6 +132,7 @@ function GameCard({
   onUninstall: () => void
   onToggle: (v: boolean) => void
 }): JSX.Element {
+  const { t } = useT()
   const isLive =
     game.installed &&
     game.integrationActive &&
@@ -183,11 +186,9 @@ function GameCard({
             strokeWidth={2.4}
           />
           <div className="text-text/85">
-            Steam запущен. Параметр{' '}
-            <code className="px-1.5 py-0.5 rounded-md bg-surface text-accent font-mono-num text-[13px] font-semibold">
-              {game.launchOption}
-            </code>{' '}
-            пропишется автоматически при следующем закрытии Steam.
+            {t('games.queued.body', {
+              opt: game.launchOption ?? '-gamestateintegration'
+            })}
           </div>
         </div>
       )}
@@ -199,18 +200,14 @@ function GameCard({
             className="text-destructive shrink-0 mt-0.5"
             strokeWidth={2.4}
           />
-          <div className="text-text/85">
-            В Steam нет залогиненного аккаунта (нет папки{' '}
-            <code className="font-mono-num text-[13px] font-semibold">userdata</code>).
-            Запусти Steam один раз и нажми «Установить интеграцию».
-          </div>
+          <div className="text-text/85">{t('games.no_user.body')}</div>
         </div>
       )}
 
       <div className="flex items-center flex-wrap gap-2 mt-4">
         {game.installed && !game.integrationActive && (
           <Button onClick={onInstall} disabled={busy} size="sm">
-            <Download size={14} strokeWidth={2.5} /> Подключить
+            <Download size={14} strokeWidth={2.5} /> {t('btn.connect')}
           </Button>
         )}
         {game.integrationActive && (
@@ -220,12 +217,12 @@ function GameCard({
             disabled={busy}
             size="sm"
           >
-            <Trash2 size={14} strokeWidth={2.5} /> Отключить
+            <Trash2 size={14} strokeWidth={2.5} /> {t('btn.disconnect')}
           </Button>
         )}
         {!game.installed && (
           <div className="text-[14px] text-text/65 font-medium">
-            Установи игру в Steam и нажми «Обновить»
+            {t('games.not_installed.hint')}
           </div>
         )}
       </div>
@@ -240,6 +237,7 @@ function StatusBadge({
   game: GameStatus
   isLive: boolean
 }): JSX.Element {
+  const { t } = useT()
   if (isLive) {
     return (
       <span className="text-[11px] px-2 py-0.5 rounded-full bg-success/15 text-success font-semibold inline-flex items-center gap-1.5">
@@ -247,40 +245,41 @@ function StatusBadge({
           <span className="absolute inline-flex h-full w-full rounded-full bg-success opacity-60 animate-ping" />
           <span className="relative inline-flex rounded-full h-1.5 w-1.5 bg-success" />
         </span>
-        Live
+        {t('games.badge.live')}
       </span>
     )
   }
   if (game.integrationActive && game.launchOptionStatus === 'applied') {
     return (
       <span className="text-[11px] px-2 py-0.5 rounded-full bg-accent/15 text-accent font-semibold inline-flex items-center gap-1.5">
-        <CheckCircle2 size={11} strokeWidth={2.5} /> Готово
+        <CheckCircle2 size={11} strokeWidth={2.5} /> {t('games.badge.ready')}
       </span>
     )
   }
   if (game.integrationActive && game.launchOptionStatus === 'queued') {
     return (
       <span className="text-[11px] px-2 py-0.5 rounded-full bg-warning/15 text-warning font-semibold">
-        В очереди
+        {t('games.badge.queued')}
       </span>
     )
   }
   if (game.installed) {
     return (
       <span className="text-[11px] px-2 py-0.5 rounded-full bg-text/10 text-text/70 font-semibold">
-        Установлена
+        {t('games.badge.installed')}
       </span>
     )
   }
   return (
     <span className="text-[11px] px-2 py-0.5 rounded-full bg-text/10 text-text/45 font-semibold">
-      Не найдена
+      {t('games.badge.not_found')}
     </span>
   )
 }
 
 function DevPanel({ games }: { games: GameStatus[] }): JSX.Element | null {
   const [open, setOpen] = useState(false)
+  const { t } = useT()
   const dota = games.find((g) => g.id === 'dota2')
   if (!dota?.enabled) return null
   return (
@@ -289,15 +288,15 @@ function DevPanel({ games }: { games: GameStatus[] }): JSX.Element | null {
         onClick={() => setOpen(!open)}
         className="text-[12px] uppercase tracking-wider text-text/40 hover:text-text/70 font-mono-num font-medium transition-colors"
       >
-        {open ? '▾' : '▸'} dev · симулировать конец матча
+        {open ? '▾' : '▸'} {t('games.dev.toggle')}
       </button>
       {open && (
         <div className="mt-3 flex flex-wrap gap-2">
           {(
             [
-              { label: '5 смертей', stats: { deaths: 5 } },
-              { label: '10 смертей', stats: { deaths: 10 } },
-              { label: '15 убийств', stats: { kills: 15 } },
+              { label: '5 deaths', stats: { deaths: 5 } },
+              { label: '10 deaths', stats: { deaths: 10 } },
+              { label: '15 kills', stats: { kills: 15 } },
               {
                 label: 'KDA 8/3/12',
                 stats: { kills: 8, deaths: 3, assists: 12 }

src/renderer/src/pages/Settings.tsx

@@ -2,7 +2,9 @@ import { useAppStore } from '../store/appStore'
 import { Switch } from '../components/ui/Switch'
 import { Card, Row, SectionHeader } from '../components/ui/Card'
 import { UpdaterCard } from '../components/UpdaterCard'
+import { useT } from '../i18n'
 import type {
+  Language,
   NotificationMode,
   Settings as SettingsType,
   Theme
@@ -10,8 +12,9 @@ import type {
 
 export default function SettingsPage(): JSX.Element {
   const settings = useAppStore((s) => s.state?.settings)
+  const { t } = useT()
   if (!settings)
-    return <div className="p-8 text-text/45">Загрузка…</div>
+    return <div className="p-8 text-text/45">{t('settings.loading')}</div>
 
   const patch = (p: Partial<SettingsType>): void => {
     window.api.updateSettings(p)
@@ -22,67 +25,89 @@ export default function SettingsPage(): JSX.Element {
       <div className="max-w-2xl mx-auto px-4 sm:px-6 lg:px-10 pt-8 pb-12">
         <div className="mb-8">
           <div className="text-[14px] text-text/65 font-semibold">
-            Конфигурация
+            {t('settings.kicker')}
           </div>
           <h1 className="font-serif text-[34px] sm:text-[40px] leading-[1.02] tracking-tight mt-1 font-bold">
-            Настройки
+            {t('settings.title')}
           </h1>
         </div>
 
-        {/* Reminders */}
-        <SectionHeader title="Напоминания" />
+        <SectionHeader title={t('settings.section.language')} />
         <Card className="mb-6">
           <SelectRow
-            label="Режим уведомления"
-            hint="Как должно выглядеть напоминание"
-            value={settings.notificationMode}
-            onChange={(v) => patch({ notificationMode: v as NotificationMode })}
+            label={t('settings.language.label')}
+            hint={t('settings.language.hint')}
+            value={settings.language}
+            onChange={(v) => patch({ language: v as Language })}
             options={[
-              { value: 'modal', label: 'Окно поверх всех' },
-              { value: 'toast', label: 'Системное уведомление' },
-              { value: 'both', label: 'Окно и уведомление' }
-            ]}
-          />
-          <ToggleRow
-            label="Звук уведомления"
-            hint="Короткий сигнал при срабатывании"
-            checked={settings.soundEnabled}
-            onChange={(v) => patch({ soundEnabled: v })}
-          />
-          <SelectRow
-            label="«Отложить» на"
-            hint="Сколько минут добавлять при отложении"
-            value={String(settings.snoozeMinutes)}
-            onChange={(v) => patch({ snoozeMinutes: Number(v) })}
-            options={[
-              { value: '1', label: '1 минута' },
-              { value: '5', label: '5 минут' },
-              { value: '10', label: '10 минут' },
-              { value: '15', label: '15 минут' },
-              { value: '30', label: '30 минут' }
+              { value: 'ru', label: t('settings.language.ru') },
+              { value: 'en', label: t('settings.language.en') }
             ]}
             last
           />
         </Card>
 
-        {/* Window */}
-        <SectionHeader title="Окно и трей" />
+        <SectionHeader title={t('settings.section.reminders')} />
+        <Card className="mb-6">
+          <SelectRow
+            label={t('settings.notification_mode.label')}
+            hint={t('settings.notification_mode.hint')}
+            value={settings.notificationMode}
+            onChange={(v) => patch({ notificationMode: v as NotificationMode })}
+            options={[
+              {
+                value: 'modal',
+                label: t('settings.notification_mode.modal')
+              },
+              {
+                value: 'toast',
+                label: t('settings.notification_mode.toast')
+              },
+              {
+                value: 'both',
+                label: t('settings.notification_mode.both')
+              }
+            ]}
+          />
+          <ToggleRow
+            label={t('settings.sound.label')}
+            hint={t('settings.sound.hint')}
+            checked={settings.soundEnabled}
+            onChange={(v) => patch({ soundEnabled: v })}
+          />
+          <SelectRow
+            label={t('settings.snooze.label')}
+            hint={t('settings.snooze.hint')}
+            value={String(settings.snoozeMinutes)}
+            onChange={(v) => patch({ snoozeMinutes: Number(v) })}
+            options={[
+              { value: '1', label: t('settings.snooze.1') },
+              { value: '5', label: t('settings.snooze.5') },
+              { value: '10', label: t('settings.snooze.10') },
+              { value: '15', label: t('settings.snooze.15') },
+              { value: '30', label: t('settings.snooze.30') }
+            ]}
+            last
+          />
+        </Card>
+
+        <SectionHeader title={t('settings.section.window')} />
         <Card className="mb-6">
           <ToggleRow
-            label="Сворачивать в трей"
-            hint="При закрытии остаётся работать в фоне"
+            label={t('settings.tray.label')}
+            hint={t('settings.tray.hint')}
             checked={settings.minimizeToTray}
             onChange={(v) => patch({ minimizeToTray: v })}
           />
           <ToggleRow
-            label="Запускать с Windows"
-            hint="Открывать при входе в систему"
+            label={t('settings.autostart.label')}
+            hint={t('settings.autostart.hint')}
             checked={settings.startWithWindows}
             onChange={(v) => patch({ startWithWindows: v })}
           />
           <ToggleRow
-            label="Запускать свёрнутым"
-            hint="При автозапуске открывать сразу в трее"
+            label={t('settings.start_minimized.label')}
+            hint={t('settings.start_minimized.hint')}
             checked={settings.startMinimized}
             onChange={(v) => patch({ startMinimized: v })}
             disabled={!settings.startWithWindows}
@@ -90,24 +115,23 @@ export default function SettingsPage(): JSX.Element {
           />
         </Card>
 
-        {/* Appearance */}
-        <SectionHeader title="Внешний вид" />
+        <SectionHeader title={t('settings.section.appearance')} />
         <Card className="mb-6">
           <SelectRow
-            label="Тема"
-            hint="Светлая / тёмная / как в системе"
+            label={t('settings.theme.label')}
+            hint={t('settings.theme.hint')}
             value={settings.theme}
             onChange={(v) => patch({ theme: v as Theme })}
             options={[
-              { value: 'system', label: 'Как в системе' },
-              { value: 'light', label: 'Светлая' },
-              { value: 'dark', label: 'Тёмная' }
+              { value: 'system', label: t('settings.theme.system') },
+              { value: 'light', label: t('settings.theme.light') },
+              { value: 'dark', label: t('settings.theme.dark') }
             ]}
             last
           />
         </Card>
 
-        <SectionHeader title="Обновления" />
+        <SectionHeader title={t('settings.section.updates')} />
         <UpdaterCard />
       </div>
     </div>

src/shared/types.ts

@@ -11,6 +11,7 @@ export type Exercise = {
 
 export type NotificationMode = 'toast' | 'modal' | 'both'
 export type Theme = 'light' | 'dark' | 'system'
+export type Language = 'ru' | 'en'
 
 export type Settings = {
   globalEnabled: boolean
@@ -20,6 +21,7 @@ export type Settings = {
   minimizeToTray: boolean
   startMinimized: boolean
   theme: Theme
+  language: Language
   snoozeMinutes: number
 }
 
@@ -71,6 +73,19 @@ export const STAT_LABELS: Record<GameStat, string> = {
   duration_min: 'минут матча'
 }
 
+export const STAT_LABELS_EN: Record<GameStat, string> = {
+  deaths: 'deaths',
+  kills: 'kills',
+  assists: 'assists',
+  last_hits: 'last hits',
+  denies: 'denies',
+  duration_min: 'match minutes'
+}
+
+export function statLabel(stat: GameStat, lang: Language): string {
+  return (lang === 'en' ? STAT_LABELS_EN : STAT_LABELS)[stat]
+}
+
 export type Challenge = {
   id: string
   name: string
@@ -103,7 +118,10 @@ export type ChallengeResult = {
   exerciseName: string
   reps: number
   statValue: number
+  /** Pre-localised label for backward compat; renderer prefers `stat`. */
   statLabel: string
+  /** Stat key; renderer uses this to localise on demand. */
+  stat?: GameStat
 }
 
 export type MatchSummary = {
@@ -122,6 +140,7 @@ export const DEFAULT_SETTINGS: Settings = {
   minimizeToTray: true,
   startMinimized: false,
   theme: 'light',
+  language: 'ru',
   snoozeMinutes: 5
 }