fix(i18n): complete Simplified Chinese core and plugin translations (#1542)

* fix(i18n): complete Chinese onboarding and navigation labels

* fix(i18n): translate remaining Chinese core and plugin interfaces

* fix(i18n): translate host editor tab overflow controls

* fix(i18n): use consistent Chinese fleet terminology

* fix(i18n): localize hardcoded controls and plugin views

* fix(i18n): translate built-in homepage widget catalog

* test(homepage): follow translated timezone placeholder

* fix(i18n): translate plugin-provided homepage widgets

* fix(i18n): localize feature settings section titles

plugins/file-manager/locales/en.json

@@ -323,7 +323,7 @@
     "sideBySide": "Side by Side",
     "inline": "Inline",
     "fileComparison": "File Comparison: {{file1}} vs {{file2}}",
-    "fileTooLarge": "File too large: {{error}}",
+    "fileTooLarge": "File is too large (> 10MB) and cannot be opened as text for security reasons.",
     "sshConnectionFailed": "SSH connection failed. Please check your connection to {{name}} ({{ip}}:{{port}})",
     "loadFileFailed": "Failed to load file: {{error}}",
     "connecting": "Connecting...",
@@ -365,7 +365,7 @@
     "comfortableLayout": "Use comfortable layout",
     "cannotLoadPdf": "Cannot load PDF",
     "pdfLoadError": "There was an error loading this PDF file.",
-    "loadingPdf": "Loading PDF...",
+    "loadingPdf": "Loading PDF viewer...",
     "loadingPage": "Loading page...",
     "cancel": "Cancel",
     "copiedItems_one": "Copied {{count}} item",
@@ -383,7 +383,16 @@
     "videoUnsupported": "Your browser cannot play this video format.",
     "downloadToPlay": "Download to play it elsewhere",
     "cannotPreviewType": "Cannot preview this file type",
-    "cannotPreviewTypeHint": "This file type has no preview. Download it to open it in another app."
+    "cannotPreviewTypeHint": "This file type has no preview. Download it to open it in another app.",
+    "loadingFile": "Loading file...",
+    "loadingImage": "Loading image...",
+    "loadingEditor": "Loading editor...",
+    "loadingPreview": "Loading preview...",
+    "loadingAudio": "Loading audio player...",
+    "emptyPreview": "Nothing to preview yet...",
+    "revert": "Revert",
+    "openAsText": "Open as Text",
+    "confirmOpenAsText": "Do you want to continue opening this file as text? This may slow down your browser."
   },
   "sftpTransfer": {
     "title": "SFTP",
@@ -539,5 +548,8 @@
     "metricsHopSourceRead": "Source → server: {{throughput}}",
     "metricsHopDestSftpWrite": "Server → dest (SFTP): {{throughput}}",
     "metricsHopDestLocalWrite": "Server → dest (local): {{throughput}}"
+  },
+  "plugin": {
+    "name": "File Manager"
   }
 }