Add French and Arabic language support

lightrag_webui/src/components/AppSettings.tsx

@@ -22,7 +22,7 @@ export default function AppSettings({ className }: AppSettingsProps) {
   const setTheme = useSettingsStore.use.setTheme()
 
   const handleLanguageChange = useCallback((value: string) => {
-    setLanguage(value as 'en' | 'zh')
+    setLanguage(value as 'en' | 'zh' | 'fr' | 'ar')
   }, [setLanguage])
 
   const handleThemeChange = useCallback((value: string) => {
@@ -47,6 +47,8 @@ export default function AppSettings({ className }: AppSettingsProps) {
               <SelectContent>
                 <SelectItem value="en">English</SelectItem>
                 <SelectItem value="zh">中文</SelectItem>
+                <SelectItem value="fr">Français</SelectItem>
+                <SelectItem value="ar">العربية</SelectItem>
               </SelectContent>
             </Select>
           </div>