feat(i18n): add fr, de, it, pt, id, ms, vi, zh-TW desktop locales

ui/desktop/src/components/settings/app/AppSettingsSection.tsx

@@ -83,6 +83,17 @@ const i18n = defineMessages({
   languageJapanese: { id: 'settings.language.japanese', defaultMessage: 'Japanese' },
   languageSpanish: { id: 'settings.language.spanish', defaultMessage: 'Spanish' },
   languageKorean: { id: 'settings.language.korean', defaultMessage: 'Korean' },
+  languageFrench: { id: 'settings.language.french', defaultMessage: 'French' },
+  languageGerman: { id: 'settings.language.german', defaultMessage: 'German' },
+  languageItalian: { id: 'settings.language.italian', defaultMessage: 'Italian' },
+  languagePortuguese: { id: 'settings.language.portuguese', defaultMessage: 'Portuguese' },
+  languageIndonesian: { id: 'settings.language.indonesian', defaultMessage: 'Indonesian' },
+  languageMalay: { id: 'settings.language.malay', defaultMessage: 'Malay' },
+  languageVietnamese: { id: 'settings.language.vietnamese', defaultMessage: 'Vietnamese' },
+  languageChineseTraditional: {
+    id: 'settings.language.zhTW',
+    defaultMessage: 'Chinese (Traditional)',
+  },
   helpTitle: { id: 'settings.help.title', defaultMessage: 'Help & feedback' },
   helpDesc: {
     id: 'settings.help.description',
@@ -147,12 +158,20 @@ const LANGUAGE_OPTIONS: Array<{ value: LanguageSetting; message: keyof typeof i1
   { value: 'system', message: 'languageSystem' },
   { value: 'en', message: 'languageEnglish' },
   { value: 'es', message: 'languageSpanish' },
+  { value: 'fr', message: 'languageFrench' },
+  { value: 'de', message: 'languageGerman' },
+  { value: 'it', message: 'languageItalian' },
+  { value: 'pt', message: 'languagePortuguese' },
+  { value: 'id', message: 'languageIndonesian' },
+  { value: 'ms', message: 'languageMalay' },
+  { value: 'vi', message: 'languageVietnamese' },
   { value: 'hi', message: 'languageHindi' },
   { value: 'ja', message: 'languageJapanese' },
   { value: 'ko', message: 'languageKorean' },
   { value: 'ru', message: 'languageRussian' },
   { value: 'tr', message: 'languageTurkish' },
   { value: 'zh-CN', message: 'languageChineseSimplified' },
+  { value: 'zh-TW', message: 'languageChineseTraditional' },
 ];
 
 interface AppSettingsSectionProps {

ui/desktop/src/i18n/index.ts

@@ -7,25 +7,30 @@
  *   3. "en" (fallback)
  *
  * For Chinese: any Simplified Chinese tag (zh, zh-CN, zh-Hans, zh-Hans-CN, zh-SG, zh-MY)
- * maps to the "zh-CN" catalog. Traditional variants (zh-TW, zh-HK, zh-Hant) are not yet
- * translated and fall through to English.
+ * maps to the "zh-CN" catalog; Traditional variants (zh-TW, zh-HK, zh-MO, zh-Hant) map to
+ * the "zh-TW" catalog.
  */
 
 // Re-export react-intl utilities that components use directly
 export { defineMessages, useIntl } from 'react-intl';
 
 /** The set of locales that have translation catalogs. */
-export const SUPPORTED_LOCALES = ['en', 'es', 'hi', 'ja', 'ko', 'ru', 'tr', 'zh-CN'] as const;
+// prettier-ignore
+export const SUPPORTED_LOCALES = [
+  'en', 'es', 'fr', 'de', 'it', 'pt', 'id', 'ms', 'vi', 'hi', 'ja', 'ko', 'ru', 'tr', 'zh-CN', 'zh-TW',
+] as const;
 export type SupportedLocale = (typeof SUPPORTED_LOCALES)[number];
 const SUPPORTED_LOCALE_SET = new Set<string>(SUPPORTED_LOCALES);
 
 /**
- * Map Simplified Chinese aliases (zh, zh-Hans*, zh-SG, zh-MY) to "zh-CN".
- * Traditional variants (zh-Hant*, zh-TW, zh-HK, zh-MO) and non-Chinese tags pass through unchanged.
+ * Map Simplified Chinese aliases (zh, zh-Hans*, zh-SG, zh-MY) to "zh-CN" and Traditional
+ * variants (zh-Hant*, zh-TW, zh-HK, zh-MO) to "zh-TW". Non-Chinese tags pass through unchanged.
  */
 function resolveChineseAlias(tag: string): string {
   const lower = tag.toLowerCase();
-  if (/^zh-(hant|tw|hk|mo)(-|$)/.test(lower)) return tag;
+  // Traditional Chinese variants (zh-Hant*, zh-TW, zh-HK, zh-MO) → "zh-TW".
+  if (/^zh-(hant|tw|hk|mo)(-|$)/.test(lower)) return 'zh-TW';
+  // Remaining Chinese tags (zh, zh-CN, zh-Hans*, zh-SG, zh-MY) → "zh-CN".
   if (lower === 'zh' || lower.startsWith('zh-')) return 'zh-CN';
   return tag;
 }