🌍 i18n: Add Tibetan and Ukrainian languages to localization (#8819)

* 🌍 i18n: Add Tibetan and Ukrainian languages to localization

* feat: Update language selector to include Tibetan and Ukrainian options
* feat: Add translation files for Tibetan and Ukrainian languages
* chore: Update English translation.json with new language keys
* docs: Create localization guide for adding new languages

* Update README.md

client/src/components/Nav/SettingsTabs/General/General.tsx

@@ -105,6 +105,8 @@ export const LangSelector = ({
     { value: 'nl-NL', label: localize('com_nav_lang_dutch') },
     { value: 'id-ID', label: localize('com_nav_lang_indonesia') },
     { value: 'fi-FI', label: localize('com_nav_lang_finnish') },
+    { value: 'bo', label: localize('com_nav_lang_tibetan') },
+    { value: 'uk-UA', label: localize('com_nav_lang_ukrainian') },
   ];
 
   return (

client/src/locales/README.md

@@ -0,0 +1,135 @@
+# LibreChat Localization Guide
+
+This guide explains how to add new languages to LibreChat's localization system.
+
+## Adding a New Language
+
+To add a new language to LibreChat, follow these steps:
+
+### 1. Add the Language to Locize Project
+
+- Navigate to the [LibreChat locize project](https://www.locize.app/cat/62uyy7c9), 
+- Click the "ADD LANGUAGE" button, typically found within the "..." menu of the "Start to translate" card on the project overview page.
+
+### 2. Update the Language Selector Component
+
+Edit `client/src/components/Nav/SettingsTabs/General/General.tsx` and add your new language option to the `languageOptions` array:
+
+```typescript
+{ value: 'language-code', label: localize('com_nav_lang_language_name') },
+```
+
+Example:
+```typescript
+{ value: 'bo', label: localize('com_nav_lang_tibetan') },
+{ value: 'uk-UA', label: localize('com_nav_lang_ukrainian') },
+```
+
+**Note:** Use the appropriate language code format:
+- Use simple codes (e.g., `bo`) for languages without regional variants
+- Use region-specific codes (e.g., `uk-UA`) when needed
+
+### 3. Add Localization Keys
+
+In `client/src/locales/en/translation.json`, add the corresponding localization key for your language label:
+
+```json
+"com_nav_lang_language_name": "Native Language Name",
+```
+
+Example:
+```json
+"com_nav_lang_tibetan": "བོད་སྐད་",
+"com_nav_lang_ukrainian": "Українська",
+```
+
+**Best Practice:** Use the native language name as the value.
+
+### 4. Create the Translation File
+
+Create a new directory and translation file:
+
+```bash
+mkdir -p client/src/locales/[language-code]
+```
+
+Create `client/src/locales/[language-code]/translation.json` with an empty JSON object:
+
+```json
+{
+}
+```
+
+Example:
+- `client/src/locales/bo/translation.json`
+- `client/src/locales/uk/translation.json`
+
+### 5. Configure i18n
+
+Update `client/src/locales/i18n.ts`:
+
+1. Import the new translation file:
+```typescript
+import translationLanguageCode from './language-code/translation.json';
+```
+
+2. Add it to the `resources` object:
+```typescript
+export const resources = {
+  // ... existing languages
+  'language-code': { translation: translationLanguageCode },
+} as const;
+```
+
+Example:
+```typescript
+import translationBo from './bo/translation.json';
+import translationUk from './uk/translation.json';
+
+export const resources = {
+  // ... existing languages
+  bo: { translation: translationBo },
+  uk: { translation: translationUk },
+} as const;
+```
+
+### 6. Handle Fallback Languages (Optional)
+
+If your language should fall back to a specific language when translations are missing, update the `fallbackLng` configuration in `i18n.ts`:
+
+```typescript
+fallbackLng: {
+  'language-variant': ['fallback-language', 'en'],
+  // ... existing fallbacks
+},
+```
+
+## Translation Process
+
+After adding a new language:
+
+1. The empty translation file will be populated through LibreChat's automated translation platform
+2. Only the English (`en`) translation file should be manually updated
+3. Other language translations are managed externally
+
+## Language Code Standards
+
+- Use ISO 639-1 codes for most languages (e.g., `en`, `fr`, `de`)
+- Use ISO 639-1 with region codes when needed (e.g., `pt-BR`, `zh-Hans`)
+- Tibetan uses `bo` (Bodic)
+- Ukrainian uses `uk` or `uk-UA` with region
+
+## Testing
+
+After adding a new language:
+
+1. Restart the development server
+2. Navigate to Settings > General
+3. Verify your language appears in the dropdown
+4. Select it to ensure it changes the UI language code
+
+## Notes
+
+- Keep language options alphabetically sorted in the dropdown for better UX
+- Always use native script for language names in the dropdown
+- The system will use English as fallback for any missing translations

client/src/locales/bo/translation.json

@@ -0,0 +1 @@
+{}

client/src/locales/en/translation.json

@@ -435,8 +435,10 @@
   "com_nav_lang_spanish": "Español",
   "com_nav_lang_swedish": "Svenska",
   "com_nav_lang_thai": "ไทย",
+  "com_nav_lang_tibetan": "བོད་སྐད་",
   "com_nav_lang_traditional_chinese": "繁體中文",
   "com_nav_lang_turkish": "Türkçe",
+  "com_nav_lang_ukrainian": "Українська",
   "com_nav_lang_uyghur": "Uyƣur tili",
   "com_nav_lang_vietnamese": "Tiếng Việt",
   "com_nav_language": "Language",

client/src/locales/i18n.ts

@@ -35,6 +35,8 @@ import translationHy from './hy/translation.json';
 import translationFi from './fi/translation.json';
 import translationZh_Hans from './zh-Hans/translation.json';
 import translationZh_Hant from './zh-Hant/translation.json';
+import translationBo from './bo/translation.json';
+import translationUk from './uk/translation.json';
 
 export const defaultNS = 'translation';
 
@@ -71,6 +73,8 @@ export const resources = {
   hu: { translation: translationHu },
   hy: { translation: translationHy },
   fi: { translation: translationFi },
+  bo: { translation: translationBo },
+  uk: { translation: translationUk },
 } as const;
 
 i18n

client/src/locales/uk/translation.json

@@ -0,0 +1 @@
+{}