feat: add i18n utils

packages/cli/src/core/auth.ts

@@ -9,6 +9,7 @@ import {
   type Config,
   getErrorMessage,
 } from '@qwen-code/qwen-code-core';
+import { t } from '../i18n/index.js';
 
 /**
  * Handles the initial authentication flow.
@@ -29,7 +30,9 @@ export async function performInitialAuth(
     // The console.log is intentionally left out here.
     // We can add a dedicated startup message later if needed.
   } catch (e) {
-    return `Failed to login. Message: ${getErrorMessage(e)}`;
+    return t('Failed to login. Message: {{message}}', {
+      message: getErrorMessage(e),
+    });
   }
 
   return null;

packages/cli/src/core/initializer.ts

@@ -14,6 +14,7 @@ import {
 import { type LoadedSettings } 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 =
+    settings.merged.general?.language ||
+    process.env['QWEN_CODE_LANG'] ||
+    'auto';
+  await initializeI18n(languageSetting);
+
   const authError = await performInitialAuth(
     config,
     settings.merged.security?.auth?.selectedType,