diff --git a/README.zh-CN.md b/README.zh-CN.md
index 0973070..b62cd21 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -1,6 +1,6 @@
 <div align="center">
   <img src="public/logo.svg" alt="Claude Code UI" width="64" height="64">
-  <h1>Cloud CLI (aka Claude Code UI)</h1>
+  <h1>Cloud CLI (又名 Claude Code UI)</h1>
 </div>
 
 
diff --git a/src/App.jsx b/src/App.jsx
index 8f10ef5..a7dbc4c 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -36,7 +36,7 @@ import ProtectedRoute from './components/ProtectedRoute';
 import { useVersionCheck } from './hooks/useVersionCheck';
 import useLocalStorage from './hooks/useLocalStorage';
 import { api, authenticatedFetch } from './utils/api';
-import { I18nextProvider } from 'react-i18next';
+import { I18nextProvider, useTranslation } from 'react-i18next';
 import i18n from './i18n/config.js';
 
 
@@ -579,6 +579,7 @@ function AppContent() {
 
   // Version Upgrade Modal Component
   const VersionUpgradeModal = () => {
+    const { t } = useTranslation('common');
     const [isUpdating, setIsUpdating] = useState(false);
     const [updateOutput, setUpdateOutput] = useState('');
     const [updateError, setUpdateError] = useState('');
@@ -639,7 +640,7 @@ function AppContent() {
         <button
           className="fixed inset-0 bg-black/50 backdrop-blur-sm"
           onClick={() => setShowVersionModal(false)}
-          aria-label="Close version upgrade modal"
+          aria-label={t('versionUpdate.ariaLabels.closeModal')}
         />
 
         {/* Modal */}
@@ -653,9 +654,9 @@ function AppContent() {
                 </svg>
               </div>
               <div>
-                <h2 className="text-lg font-semibold text-gray-900 dark:text-white">Update Available</h2>
+                <h2 className="text-lg font-semibold text-gray-900 dark:text-white">{t('versionUpdate.title')}</h2>
                 <p className="text-sm text-gray-500 dark:text-gray-400">
-                  {releaseInfo?.title || 'A new version is ready'}
+                  {releaseInfo?.title || t('versionUpdate.newVersionReady')}
                 </p>
               </div>
             </div>
@@ -672,11 +673,11 @@ function AppContent() {
           {/* Version Info */}
           <div className="space-y-3">
             <div className="flex justify-between items-center p-3 bg-gray-50 dark:bg-gray-700/50 rounded-lg">
-              <span className="text-sm font-medium text-gray-700 dark:text-gray-300">Current Version</span>
+              <span className="text-sm font-medium text-gray-700 dark:text-gray-300">{t('versionUpdate.currentVersion')}</span>
               <span className="text-sm text-gray-900 dark:text-white font-mono">{currentVersion}</span>
             </div>
             <div className="flex justify-between items-center p-3 bg-blue-50 dark:bg-blue-900/20 rounded-lg border border-blue-200 dark:border-blue-700">
-              <span className="text-sm font-medium text-blue-700 dark:text-blue-300">Latest Version</span>
+              <span className="text-sm font-medium text-blue-700 dark:text-blue-300">{t('versionUpdate.latestVersion')}</span>
               <span className="text-sm text-blue-900 dark:text-blue-100 font-mono">{latestVersion}</span>
             </div>
           </div>
@@ -685,7 +686,7 @@ function AppContent() {
           {releaseInfo?.body && (
             <div className="space-y-3">
               <div className="flex items-center justify-between">
-                <h3 className="text-sm font-medium text-gray-900 dark:text-white">What's New:</h3>
+                <h3 className="text-sm font-medium text-gray-900 dark:text-white">{t('versionUpdate.whatsNew')}</h3>
                 {releaseInfo?.htmlUrl && (
                   <a
                     href={releaseInfo.htmlUrl}
@@ -693,7 +694,7 @@ function AppContent() {
                     rel="noopener noreferrer"
                     className="text-xs text-blue-600 dark:text-blue-400 hover:text-blue-700 dark:hover:text-blue-300 hover:underline flex items-center gap-1"
                   >
-                    View full release
+                    {t('versionUpdate.viewFullRelease')}
                     <svg className="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                       <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10 6H6a2 2 0 00-2 2v10a2 2 0 002 2h10a2 2 0 002-2v-4M14 4h6m0 0v6m0-6L10 14" />
                     </svg>
@@ -711,7 +712,7 @@ function AppContent() {
           {/* Update Output */}
           {updateOutput && (
             <div className="space-y-2">
-              <h3 className="text-sm font-medium text-gray-900 dark:text-white">Update Progress:</h3>
+              <h3 className="text-sm font-medium text-gray-900 dark:text-white">{t('versionUpdate.updateProgress')}</h3>
               <div className="bg-gray-900 dark:bg-gray-950 rounded-lg p-4 border border-gray-700 max-h-48 overflow-y-auto">
                 <pre className="text-xs text-green-400 font-mono whitespace-pre-wrap">{updateOutput}</pre>
               </div>
@@ -721,14 +722,14 @@ function AppContent() {
           {/* Upgrade Instructions */}
           {!isUpdating && !updateOutput && (
             <div className="space-y-3">
-              <h3 className="text-sm font-medium text-gray-900 dark:text-white">Manual upgrade:</h3>
+              <h3 className="text-sm font-medium text-gray-900 dark:text-white">{t('versionUpdate.manualUpgrade')}</h3>
               <div className="bg-gray-100 dark:bg-gray-800 rounded-lg p-3 border">
                 <code className="text-sm text-gray-800 dark:text-gray-200 font-mono">
                   git checkout main && git pull && npm install
                 </code>
               </div>
               <p className="text-xs text-gray-600 dark:text-gray-400">
-                Or click "Update Now" to run the update automatically.
+                {t('versionUpdate.manualUpgradeHint')}
               </p>
             </div>
           )}
@@ -739,7 +740,7 @@ function AppContent() {
               onClick={() => setShowVersionModal(false)}
               className="flex-1 px-4 py-2 text-sm font-medium text-gray-700 dark:text-gray-300 bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded-md transition-colors"
             >
-              {updateOutput ? 'Close' : 'Later'}
+              {updateOutput ? t('versionUpdate.buttons.close') : t('versionUpdate.buttons.later')}
             </button>
             {!updateOutput && (
               <>
@@ -749,7 +750,7 @@ function AppContent() {
                   }}
                   className="flex-1 px-4 py-2 text-sm font-medium text-gray-700 dark:text-gray-300 bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded-md transition-colors"
                 >
-                  Copy Command
+                  {t('versionUpdate.buttons.copyCommand')}
                 </button>
                 <button
                   onClick={handleUpdateNow}
@@ -759,10 +760,10 @@ function AppContent() {
                   {isUpdating ? (
                     <>
                       <div className="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin" />
-                      Updating...
+                      {t('versionUpdate.buttons.updating')}
                     </>
                   ) : (
-                    'Update Now'
+                    t('versionUpdate.buttons.updateNow')
                   )}
                 </button>
               </>
@@ -813,8 +814,8 @@ function AppContent() {
                 <button
                   onClick={() => setSidebarVisible(true)}
                   className="p-2 hover:bg-accent rounded-md transition-colors duration-200 group"
-                  aria-label="Show sidebar"
-                  title="Show sidebar"
+                  aria-label={t('versionUpdate.ariaLabels.showSidebar')}
+                  title={t('versionUpdate.ariaLabels.showSidebar')}
                 >
                   <svg
                     className="w-5 h-5 text-foreground group-hover:scale-110 transition-transform"
@@ -830,8 +831,8 @@ function AppContent() {
                 <button
                   onClick={() => setShowSettings(true)}
                   className="p-2 hover:bg-accent rounded-md transition-colors duration-200"
-                  aria-label="Settings"
-                  title="Settings"
+                  aria-label={t('versionUpdate.ariaLabels.settings')}
+                  title={t('versionUpdate.ariaLabels.settings')}
                 >
                   <SettingsIcon className="w-5 h-5 text-muted-foreground hover:text-foreground transition-colors" />
                 </button>
@@ -841,8 +842,8 @@ function AppContent() {
                   <button
                     onClick={() => setShowVersionModal(true)}
                     className="relative p-2 hover:bg-accent rounded-md transition-colors duration-200"
-                    aria-label="Update available"
-                    title="Update available"
+                    aria-label={t('versionUpdate.ariaLabels.updateAvailable')}
+                    title={t('versionUpdate.ariaLabels.updateAvailable')}
                   >
                     <Sparkles className="w-5 h-5 text-blue-500" />
                     <span className="absolute top-1 right-1 w-2 h-2 bg-blue-500 rounded-full animate-pulse" />
@@ -870,7 +871,7 @@ function AppContent() {
               e.stopPropagation();
               setSidebarOpen(false);
             }}
-            aria-label="Close sidebar"
+            aria-label={t('versionUpdate.ariaLabels.closeSidebar')}
           />
           <div
             className={`relative w-[85vw] max-w-sm sm:w-80 h-full bg-card border-r border-border transform transition-transform duration-150 ease-out ${
diff --git a/src/components/Sidebar.jsx b/src/components/Sidebar.jsx
index 35a56a2..8b0e099 100644
--- a/src/components/Sidebar.jsx
+++ b/src/components/Sidebar.jsx
@@ -669,7 +669,7 @@ function Sidebar({
               <p className="text-sm text-muted-foreground">
                 {t('projects.fetchingProjects')}
               </p>
-              <h3 className="text-base font-medium text-foreground mb-2 md:mb-1">Loading projects...</h3>
+              <h3 className="text-base font-medium text-foreground mb-2 md:mb-1">{t('projects.loadingProjects')}</h3>
               {loadingProgress && loadingProgress.total > 0 ? (
                 <div className="space-y-2">
                   <div className="w-full bg-muted rounded-full h-2 overflow-hidden">
@@ -679,7 +679,7 @@ function Sidebar({
                     />
                   </div>
                   <p className="text-sm text-muted-foreground">
-                    {loadingProgress.current}/{loadingProgress.total} projects
+                    {loadingProgress.current}/{loadingProgress.total} {t('projects.projects')}
                   </p>
                   {loadingProgress.currentProject && (
                     <p className="text-xs text-muted-foreground/70 truncate max-w-[200px] mx-auto" title={loadingProgress.currentProject}>
@@ -689,7 +689,7 @@ function Sidebar({
                 </div>
               ) : (
                 <p className="text-sm text-muted-foreground">
-                  Fetching your Claude projects and sessions
+                  {t('projects.fetchingProjects')}
                 </p>
               )}
             </div>
diff --git a/src/i18n/locales/en/common.json b/src/i18n/locales/en/common.json
index ffc7972..bb2d6bc 100644
--- a/src/i18n/locales/en/common.json
+++ b/src/i18n/locales/en/common.json
@@ -186,5 +186,33 @@
       "providePath": "Please provide a workspace path",
       "failedToCreate": "Failed to create workspace"
     }
+  },
+  "versionUpdate": {
+    "title": "Update Available",
+    "newVersionReady": "A new version is ready",
+    "currentVersion": "Current Version",
+    "latestVersion": "Latest Version",
+    "whatsNew": "What's New:",
+    "viewFullRelease": "View full release",
+    "updateProgress": "Update Progress:",
+    "manualUpgrade": "Manual upgrade:",
+    "manualUpgradeHint": "Or click \"Update Now\" to run the update automatically.",
+    "updateCompleted": "Update completed successfully!",
+    "restartServer": "Please restart the server to apply changes.",
+    "updateFailed": "Update failed",
+    "buttons": {
+      "close": "Close",
+      "later": "Later",
+      "copyCommand": "Copy Command",
+      "updateNow": "Update Now",
+      "updating": "Updating..."
+    },
+    "ariaLabels": {
+      "closeModal": "Close version upgrade modal",
+      "showSidebar": "Show sidebar",
+      "settings": "Settings",
+      "updateAvailable": "Update available",
+      "closeSidebar": "Close sidebar"
+    }
   }
 }
diff --git a/src/i18n/locales/en/sidebar.json b/src/i18n/locales/en/sidebar.json
index eb7a0d9..5662c2e 100644
--- a/src/i18n/locales/en/sidebar.json
+++ b/src/i18n/locales/en/sidebar.json
@@ -14,6 +14,7 @@
     "newSession": "New Session",
     "codexSession": "Codex Session",
     "fetchingProjects": "Fetching your Claude projects and sessions",
+    "projects": "projects",
     "noMatchingProjects": "No matching projects",
     "tryDifferentSearch": "Try adjusting your search term",
     "runClaudeCli": "Run Claude CLI in a project directory to get started"
diff --git a/src/i18n/locales/zh-CN/common.json b/src/i18n/locales/zh-CN/common.json
index 1f8bc04..9c66ca8 100644
--- a/src/i18n/locales/zh-CN/common.json
+++ b/src/i18n/locales/zh-CN/common.json
@@ -186,5 +186,33 @@
       "providePath": "请提供工作区路径",
       "failedToCreate": "创建工作区失败"
     }
+  },
+  "versionUpdate": {
+    "title": "有可用更新",
+    "newVersionReady": "新版本已准备就绪",
+    "currentVersion": "当前版本",
+    "latestVersion": "最新版本",
+    "whatsNew": "新内容：",
+    "viewFullRelease": "查看完整发布",
+    "updateProgress": "更新进度：",
+    "manualUpgrade": "手动升级：",
+    "manualUpgradeHint": "或点击'立即更新'以自动运行更新。",
+    "updateCompleted": "更新成功完成！",
+    "restartServer": "请重启服务器以应用更改。",
+    "updateFailed": "更新失败",
+    "buttons": {
+      "close": "关闭",
+      "later": "稍后",
+      "copyCommand": "复制命令",
+      "updateNow": "立即更新",
+      "updating": "更新中..."
+    },
+    "ariaLabels": {
+      "closeModal": "关闭版本升级模态框",
+      "showSidebar": "显示侧边栏",
+      "settings": "设置",
+      "updateAvailable": "有可用更新",
+      "closeSidebar": "关闭侧边栏"
+    }
   }
 }
diff --git a/src/i18n/locales/zh-CN/sidebar.json b/src/i18n/locales/zh-CN/sidebar.json
index e5e3c65..d3de963 100644
--- a/src/i18n/locales/zh-CN/sidebar.json
+++ b/src/i18n/locales/zh-CN/sidebar.json
@@ -14,6 +14,7 @@
     "newSession": "新会话",
     "codexSession": "Codex 会话",
     "fetchingProjects": "正在获取您的 Claude 项目和会话",
+    "projects": "项目",
     "noMatchingProjects": "未找到匹配的项目",
     "tryDifferentSearch": "尝试调整您的搜索词",
     "runClaudeCli": "在项目目录中运行 Claude CLI 以开始使用"