Add Japanese locale (ja) support (#1810)

* Add Japanese locale (ja) support

- New: ja.ts with 2624 UI translation keys
- New: ja.settings.ts with 1789 settings translation keys
- Registered ja in runtime.ts (Locale type, LOCALES, LOCALE_LABEL_KEYS, normalizeLocale)
- Added ja-JP BCP-47 mapping in intl.ts
- Added JA_MESSAGES in bootstrap.ts
- Added ja to lazy-load dictionary map in store.ts
- Updated messages.test.ts with ja dictionary
- Added common.language.japanese to all 8 existing locale files

* fix(i18n): complete Japanese locale updates

* test(i18n): enforce locale key parity

* docs: add Japanese documentation

---------

Co-authored-by: yuchi0531 <yuchi0531@users.noreply.github.com>
Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/lib/i18n/bootstrap.ts

@@ -57,7 +57,30 @@ const FR_MESSAGES: BootstrapMessages = {
   loadingData: (providersText, agentsText) => `Chargement des données (${providersText}, ${agentsText})…`,
 };
 
-export const getBootstrapMessages = (locale: Locale): BootstrapMessages => (locale === 'fr' ? FR_MESSAGES : EN_MESSAGES);
+const JA_MESSAGES: BootstrapMessages = {
+  startingApi: 'OpenCode API を起動中…',
+  initializing: '初期化中…',
+  connecting: '接続中…',
+  connected: '接続完了！',
+  connectionError: '接続エラー',
+  disconnected: '切断されました',
+  reconnecting: '再接続中…',
+  initialDataLoadFailed: 'OpenCode に接続しましたが、初期データの読み込みに失敗しました。',
+  cliNotFound: 'OpenCode CLI が見つかりません。先にインストールしてください。',
+  providersReady: '✓ プロバイダ',
+  providersLoading: '… プロバイダ',
+  agentsReady: '✓ エージェント',
+  agentsLoading: '… エージェント',
+  startingDevServer: (hostLabel) => `Webview 開発サーバーを起動中 (${hostLabel})...`,
+  waitingDevServer: (hostLabel, attempt) => `Webview 開発サーバーを待機中 (${hostLabel})... 試行 ${attempt}`,
+  loadingData: (providersText, agentsText) => `データを読み込み中 (${providersText}, ${agentsText})…`,
+};
+
+export const getBootstrapMessages = (locale: Locale): BootstrapMessages => {
+  if (locale === 'fr') return FR_MESSAGES;
+  if (locale === 'ja') return JA_MESSAGES;
+  return EN_MESSAGES;
+};
 
 export const readStoredLocaleForBootstrap = (): Locale => {
   if (typeof window === 'undefined') {

packages/ui/src/lib/i18n/intl.ts

@@ -11,6 +11,7 @@ const INTL_LOCALE_BY_LOCALE: Record<Locale, string> = {
   'pt-BR': 'pt-BR',
   ko: 'ko-KR',
   pl: 'pl-PL',
+  ja: 'ja-JP',
 };
 
 const getIntlLocale = (locale: Locale): string => INTL_LOCALE_BY_LOCALE[locale] ?? 'en-US';

packages/ui/src/lib/i18n/messages.test.ts

@@ -3,6 +3,7 @@ import { describe, expect, test } from 'bun:test';
 import { dict as enDict } from './messages/en';
 import { dict as esDict } from './messages/es';
 import { dict as frDict } from './messages/fr';
+import { dict as jaDict } from './messages/ja';
 import { dict as koDict } from './messages/ko';
 import { dict as plDict } from './messages/pl';
 import { dict as ptBrDict } from './messages/pt-BR';
@@ -14,6 +15,7 @@ const localeDictionaries = {
   en: enDict,
   fr: frDict,
   es: esDict,
+  ja: jaDict,
   'pt-BR': ptBrDict,
   uk: ukDict,
   ko: koDict,
@@ -23,15 +25,18 @@ const localeDictionaries = {
 } as const;
 
 describe('i18n dictionaries', () => {
-  test('french stays in key parity with english', () => {
+  test('all locales stay in key parity with english', () => {
     const englishKeys = Object.keys(enDict).sort();
 
-    expect(Object.keys(frDict).sort()).toEqual(englishKeys);
+    for (const dictionary of Object.values(localeDictionaries)) {
+      expect(Object.keys(dictionary).sort()).toEqual(englishKeys);
+    }
   });
 
-  test('all locales expose the french language label key', () => {
+  test('all locales expose language label keys', () => {
     for (const [, dictionary] of Object.entries(localeDictionaries)) {
       expect(dictionary['common.language.french']).toBeTruthy();
+      expect(dictionary['common.language.japanese']).toBeTruthy();
     }
   });
 });

packages/ui/src/lib/i18n/messages/en.ts

@@ -13,6 +13,7 @@ export const dict = {
   'common.language.brazilianPortuguese': 'Brazilian Portuguese',
   'common.language.korean': 'Korean',
   'common.language.polish': 'Polish',
+  'common.language.japanese': 'Japanese',
   'common.revealPath.finder': 'Reveal in Finder',
   'common.revealPath.fileExplorer': 'Open in File Explorer',
   'common.revealPath.fileManager': 'Open in File Manager',

packages/ui/src/lib/i18n/messages/es.ts

@@ -14,6 +14,7 @@ export const dict: Record<I18nKey, string> = {
   "common.language.brazilianPortuguese": "Portugués brasileño",
   "common.language.korean": "Coreano",
   "common.language.polish": "Polaco",
+  "common.language.japanese": "Japonés",
   "common.revealPath.finder": "Mostrar en Finder",
   "common.revealPath.fileExplorer": "Abrir en File Explorer",
   "common.revealPath.fileManager": "Abrir en gestor de archivos",

packages/ui/src/lib/i18n/messages/fr.ts

@@ -13,6 +13,7 @@ export const dict = {
   'common.language.brazilianPortuguese': 'Portugais brésilien',
   'common.language.korean': 'Coréen',
   'common.language.polish': 'Polonais',
+  'common.language.japanese': 'Japonais',
   'common.revealPath.finder': 'Révéler dans le Finder',
   'common.revealPath.fileExplorer': 'Ouvrir dans l\'explorateur de fichiers',
   'common.revealPath.fileManager': 'Ouvrir dans le gestionnaire de fichiers',
@@ -103,6 +104,7 @@ export const dict = {
   'sessions.scheduledTasks.editor.scheduleType.daily': 'Tous les jours',
   'sessions.scheduledTasks.editor.scheduleType.weekly': 'Hebdomadaire',
   'sessions.scheduledTasks.editor.scheduleType.once': 'Une fois',
+  'sessions.scheduledTasks.editor.scheduleType.cron': 'Cron',
   'sessions.scheduledTasks.editor.date.label': 'Date',
   'sessions.scheduledTasks.editor.date.placeholder': 'Sélectionnez une date',
   'sessions.scheduledTasks.editor.date.previousMonth': 'Mois précédent',

packages/ui/src/lib/i18n/messages/ko.ts

@@ -14,6 +14,7 @@ export const dict: Record<I18nKey, string> = {
   'common.language.brazilianPortuguese': '브라질 포르투갈어',
   'common.language.korean': '한국어',
   'common.language.polish': '폴란드어',
+  'common.language.japanese': '일본어',
   'common.revealPath.finder': 'Finder에서 보기',
   'common.revealPath.fileExplorer': 'File Explorer에서 열기',
   'common.revealPath.fileManager': '파일 관리자에서 열기',

packages/ui/src/lib/i18n/messages/pl.ts

@@ -15,6 +15,7 @@ export const dict: Record<I18nKey, string> = {
   'common.language.brazilianPortuguese': 'Portugalski (Brazylia)',
   'common.language.korean': 'Koreański',
   'common.language.polish': 'Polski',
+  'common.language.japanese': 'Japoński',
   'common.revealPath.finder': 'Pokaż w Finderze',
   'common.revealPath.fileExplorer': 'Otwórz w Eksploratorze plików',
   'common.revealPath.fileManager': 'Otwórz w Menedżerze plików',

packages/ui/src/lib/i18n/messages/pt-BR.ts

@@ -14,6 +14,7 @@ export const dict: Record<I18nKey, string> = {
   "common.language.brazilianPortuguese": "Português brasileiro",
   "common.language.korean": "Coreano",
   "common.language.polish": "Polonês",
+  "common.language.japanese": "Japonês",
   "common.revealPath.finder": "Mostrar no Finder",
   "common.revealPath.fileExplorer": "Abrir no File Explorer",
   "common.revealPath.fileManager": "Abrir no gerenciador de arquivos",

packages/ui/src/lib/i18n/messages/uk.ts

@@ -14,6 +14,7 @@ export const dict: Record<I18nKey, string> = {
   "common.language.brazilianPortuguese": "Бразильська португальська",
   "common.language.korean": "Корейська",
   "common.language.polish": "Польська",
+  "common.language.japanese": "Японська",
   "common.revealPath.finder": "Показати у Finder",
   "common.revealPath.fileExplorer": "Відкрити у File Explorer",
   "common.revealPath.fileManager": "Відкрити у файловому менеджері",

packages/ui/src/lib/i18n/messages/zh-CN.ts

@@ -14,6 +14,7 @@ export const dict: Record<I18nKey, string> = {
   'common.language.brazilianPortuguese': '巴西葡萄牙语',
   'common.language.korean': '韩语',
   'common.language.polish': '波兰语',
+  'common.language.japanese': '日语',
   'common.revealPath.finder': '在 Finder 中显示',
   'common.revealPath.fileExplorer': '在文件资源管理器中打开',
   'common.revealPath.fileManager': '在文件管理器中打开',

packages/ui/src/lib/i18n/messages/zh-TW.ts

@@ -14,6 +14,7 @@ export const dict: Record<I18nKey, string> = {
   'common.language.brazilianPortuguese': '巴西葡萄牙語',
   'common.language.korean': '韓語',
   'common.language.polish': '波蘭語',
+  'common.language.japanese': '日語',
   'common.revealPath.finder': '在 Finder 中顯示',
   'common.revealPath.fileExplorer': '在檔案總管中開啟',
   'common.revealPath.fileManager': '在檔案管理員中開啟',

packages/ui/src/lib/i18n/runtime.ts

@@ -1,10 +1,10 @@
-export type Locale = 'en' | 'fr' | 'zh-CN' | 'zh-TW' | 'uk' | 'es' | 'pt-BR' | 'ko' | 'pl';
+export type Locale = 'en' | 'fr' | 'zh-CN' | 'zh-TW' | 'uk' | 'es' | 'pt-BR' | 'ko' | 'pl' | 'ja';
 
-export const LOCALES = ['en', 'fr', 'zh-CN', 'zh-TW', 'uk', 'es', 'pt-BR', 'ko', 'pl'] as const satisfies readonly Locale[];
+export const LOCALES = ['en', 'fr', 'zh-CN', 'zh-TW', 'uk', 'es', 'pt-BR', 'ko', 'pl', 'ja'] as const satisfies readonly Locale[];
 
 export const DEFAULT_LOCALE: Locale = 'en';
 
-export const LOCALE_LABEL_KEYS: Record<Locale, 'common.language.english' | 'common.language.french' | 'common.language.simplifiedChinese' | 'common.language.traditionalChinese' | 'common.language.ukrainian' | 'common.language.spanish' | 'common.language.brazilianPortuguese' | 'common.language.korean' | 'common.language.polish'> = {
+export const LOCALE_LABEL_KEYS: Record<Locale, 'common.language.english' | 'common.language.french' | 'common.language.simplifiedChinese' | 'common.language.traditionalChinese' | 'common.language.ukrainian' | 'common.language.spanish' | 'common.language.brazilianPortuguese' | 'common.language.korean' | 'common.language.polish' | 'common.language.japanese'> = {
   en: 'common.language.english',
   fr: 'common.language.french',
   'zh-CN': 'common.language.simplifiedChinese',
@@ -14,6 +14,7 @@ export const LOCALE_LABEL_KEYS: Record<Locale, 'common.language.english' | 'comm
   'pt-BR': 'common.language.brazilianPortuguese',
   ko: 'common.language.korean',
   pl: 'common.language.polish',
+  ja: 'common.language.japanese',
 };
 
 export const LOCALE_STORAGE_KEY = 'openchamber.i18n.v1';
@@ -55,6 +56,9 @@ export function normalizeLocale(value: string | undefined | null): Locale {
   if (normalized === 'ko' || normalized.startsWith('ko-')) {
     return 'ko';
   }
+  if (normalized === 'ja' || normalized.startsWith('ja-')) {
+    return 'ja';
+  }
   if (normalized === 'pl' || normalized.startsWith('pl-')) {
     return 'pl';
   }

packages/ui/src/lib/i18n/store.ts

@@ -42,7 +42,9 @@ async function loadDictionary(locale: Locale): Promise<I18nDictionary> {
               ? await import('./messages/ko') as { dict: I18nDictionary }
               : locale === 'pl'
                 ? await import('./messages/pl') as { dict: I18nDictionary }
-                : { dict: enDict };
+                : locale === 'ja'
+                  ? await import('./messages/ja') as { dict: I18nDictionary }
+                  : { dict: enDict };
   dictionaries.set(locale, mod.dict);
   return mod.dict;
 }