feat(i18n): Add Internationalization Support for UI and LLM Output (#1058)

packages/cli/src/core/initializer.ts

@@ -14,6 +14,7 @@ import {
 import { type LoadedSettings, SettingScope } from '../config/settings.js';
 import { performInitialAuth } from './auth.js';
 import { validateTheme } from './theme.js';
+import { initializeI18n } from '../i18n/index.js';
 
 export interface InitializationResult {
   authError: string | null;
@@ -33,6 +34,13 @@ export async function initializeApp(
   config: Config,
   settings: LoadedSettings,
 ): Promise<InitializationResult> {
+  // Initialize i18n system
+  const languageSetting =
+    process.env['QWEN_CODE_LANG'] ||
+    settings.merged.general?.language ||
+    'auto';
+  await initializeI18n(languageSetting);
+
   const authType = settings.merged.security?.auth?.selectedType;
   const authError = await performInitialAuth(config, authType);
 
@@ -44,7 +52,6 @@ export async function initializeApp(
       undefined,
     );
   }
-
   const themeError = validateTheme(settings);
 
   const shouldOpenAuthDialog =

packages/cli/src/core/theme.ts

@@ -6,6 +6,7 @@
 
 import { themeManager } from '../ui/themes/theme-manager.js';
 import { type LoadedSettings } from '../config/settings.js';
+import { t } from '../i18n/index.js';
 
 /**
  * Validates the configured theme.
@@ -15,7 +16,9 @@ import { type LoadedSettings } from '../config/settings.js';
 export function validateTheme(settings: LoadedSettings): string | null {
   const effectiveTheme = settings.merged.ui?.theme;
   if (effectiveTheme && !themeManager.findThemeByName(effectiveTheme)) {
-    return `Theme "${effectiveTheme}" not found.`;
+    return t('Theme "{{themeName}}" not found.', {
+      themeName: effectiveTheme,
+    });
   }
   return null;
 }