FIX: Complete internationalization for text and code editors

Missing i18n Fixes:
- Replace "Unknown size" with t("fileManager.unknownSize")
- Replace "File is empty" with t("fileManager.fileIsEmpty")
- Replace "Modified:" with t("fileManager.modified")
- Replace "Large File Warning" with t("fileManager.largeFileWarning")
- Replace file size warning message with t("fileManager.largeFileWarningDesc")

Credential Editor i18n:
- Replace "Invalid Key" with t("credentials.invalidKey")
- Replace "Detection Error" with t("credentials.detectionError")
- Replace "Unknown" with t("credentials.unknown")

Translation Additions:
- English: unknownSize, fileIsEmpty, modified, largeFileWarning, largeFileWarningDesc
- English: invalidKey, detectionError, unknown for credentials
- Chinese: corresponding translations for all new keys

Technical Improvements:
- Update formatFileSize function to accept translation function parameter
- Ensure proper translation interpolation for dynamic content

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/locales/en/translation.json

@@ -150,7 +150,10 @@
     "generateRSA": "Generate RSA",
     "keyPairGeneratedSuccessfully": "{{keyType}} key pair generated successfully",
     "failedToGenerateKeyPair": "Failed to generate key pair",
-    "generateKeyPairNote": "Generate a new SSH key pair directly. This will replace any existing keys in the form."
+    "generateKeyPairNote": "Generate a new SSH key pair directly. This will replace any existing keys in the form.",
+    "invalidKey": "Invalid Key",
+    "detectionError": "Detection Error",
+    "unknown": "Unknown"
   },
   "sshTools": {
     "title": "SSH Tools",
@@ -852,6 +855,11 @@
     "find": "Find...",
     "replaceWith": "Replace with...",
     "startTyping": "Start typing...",
+    "unknownSize": "Unknown size",
+    "fileIsEmpty": "File is empty",
+    "modified": "Modified",
+    "largeFileWarning": "Large File Warning",
+    "largeFileWarningDesc": "This file is {{size}} in size, which may cause performance issues when opened as text.",
     "fileSavedSuccessfully": "File saved successfully",
     "autoSaveFailed": "Auto-save failed",
     "fileAutoSaved": "File auto-saved",

src/locales/zh/translation.json

@@ -149,7 +149,10 @@
     "generateRSA": "生成 RSA",
     "keyPairGeneratedSuccessfully": "{{keyType}} 密钥对生成成功",
     "failedToGenerateKeyPair": "生成密钥对失败",
-    "generateKeyPairNote": "直接生成新的SSH密钥对。这将替换表单中的现有密钥。"
+    "generateKeyPairNote": "直接生成新的SSH密钥对。这将替换表单中的现有密钥。",
+    "invalidKey": "无效密钥",
+    "detectionError": "检测错误",
+    "unknown": "未知"
   },
   "sshTools": {
     "title": "SSH 工具",
@@ -761,6 +764,11 @@
     "filesCopiedToClipboard": "{{count}} 个项目已复制到剪贴板",
     "filesCutToClipboard": "{{count}} 个项目已剪切到剪贴板",
     "movedItems": "已移动 {{count}} 个项目",
+    "unknownSize": "未知大小",
+    "fileIsEmpty": "文件为空",
+    "modified": "修改时间",
+    "largeFileWarning": "大文件警告",
+    "largeFileWarningDesc": "此文件大小为 {{size}}，以文本形式打开可能会导致性能问题。",
     "failedToDeleteItem": "删除项目失败",
     "itemRenamedSuccessfully": "{{type}}重命名成功",
     "failedToRenameItem": "重命名项目失败",

src/ui/Desktop/Apps/Credentials/CredentialEditor.tsx

@@ -315,9 +315,9 @@ export function CredentialEditor({
       "ssh-dss": "DSA (SSH)",
       "rsa-sha2-256": "RSA-SHA2-256",
       "rsa-sha2-512": "RSA-SHA2-512",
-      invalid: "Invalid Key",
-      error: "Detection Error",
-      unknown: "Unknown",
+      invalid: t("credentials.invalidKey"),
+      error: t("credentials.detectionError"),
+      unknown: t("credentials.unknown"),
     };
     return keyTypeMap[keyType] || keyType;
   };

src/ui/Desktop/Apps/File Manager/components/FileViewer.tsx

@@ -261,8 +261,8 @@ function getLanguageExtension(filename: string) {
 }
 
 // Format file size
-function formatFileSize(bytes?: number): string {
-  if (!bytes) return "Unknown size";
+function formatFileSize(bytes?: number, t?: any): string {
+  if (!bytes) return t ? t("fileManager.unknownSize") : "Unknown size";
   const sizes = ["B", "KB", "MB", "GB"];
   const i = Math.floor(Math.log(bytes) / Math.log(1024));
   return `${(bytes / Math.pow(1024, i)).toFixed(1)} ${sizes[i]}`;
@@ -504,8 +504,8 @@ export function FileViewer({
             <div>
               <h3 className="font-medium text-foreground">{file.name}</h3>
               <div className="flex items-center gap-4 text-sm text-muted-foreground">
-                <span>{formatFileSize(file.size)}</span>
-                {file.modified && <span>Modified: {file.modified}</span>}
+                <span>{formatFileSize(file.size, t)}</span>
+                {file.modified && <span>{t("fileManager.modified")}: {file.modified}</span>}
                 <span
                   className={cn(
                     "px-2 py-1 rounded-full text-xs",
@@ -670,11 +670,10 @@ export function FileViewer({
                 <AlertCircle className="w-6 h-6 text-destructive flex-shrink-0 mt-0.5" />
                 <div>
                   <h3 className="font-medium text-foreground mb-2">
-                    Large File Warning
+                    {t("fileManager.largeFileWarning")}
                   </h3>
                   <p className="text-sm text-muted-foreground mb-3">
-                    This file is {formatFileSize(file.size)} in size, which may
-                    cause performance issues when opened as text.
+                    {t("fileManager.largeFileWarningDesc", { size: formatFileSize(file.size, t) })}
                   </p>
                   {isTooLarge ? (
                     <div className="bg-destructive/10 border border-destructive/30 rounded p-3 mb-4">
@@ -854,7 +853,7 @@ export function FileViewer({
                 ) : (
                   // Only show as read-only for non-editable files (media files)
                   <div className="h-full p-4 font-mono text-sm whitespace-pre-wrap overflow-auto bg-background text-foreground">
-                    {editedContent || content || "File is empty"}
+                    {editedContent || content || t("fileManager.fileIsEmpty")}
                   </div>
                 )}
               </div>