feat: 增加手动设置编辑器编码的功能

Related to #5

packages/frontend/src/locales/en-US.json

@@ -333,7 +333,9 @@
     "noOpenFile": "No file open",
     "selectFileToEdit": "Select a file from the file manager to start editing.",
     "searchPlaceholder": "Search files...",
-    "dropFilesHere": "Drop files here to upload"
+    "dropFilesHere": "Drop files here to upload",
+    "changeEncodingTooltip": "Change file encoding",
+    "loadingEncoding": "Loading..."
   },
   "statusMonitor": {
     "title": "Server Status",

packages/frontend/src/locales/ja-JP.json

@@ -327,7 +327,9 @@
         "uploadTasks": "アップロードタスク",
         "warnings": {
             "moveSameDirectory": "同じディレクトリ内で切り取りと貼り付けはできません。"
-        }
+        },
+        "changeEncodingTooltip": "ファイルエンコーディングを変更",
+        "loadingEncoding": "読み込み中..."
     },
     "focusSwitcher": {
         "allInputsConfigured": "すべての利用可能な入力ソースが設定されました",

packages/frontend/src/locales/zh-CN.json

@@ -333,7 +333,9 @@
     "noOpenFile": "未打开文件",
     "selectFileToEdit": "请从文件管理器中选择文件以开始编辑。",
     "searchPlaceholder": "搜索文件...",
-    "dropFilesHere": "将文件拖拽到此处上传"
+    "dropFilesHere": "将文件拖拽到此处上传",
+    "changeEncodingTooltip": "更改文件编码",
+    "loadingEncoding": "加载中..."
   },
   "statusMonitor": {
     "title": "服务器状态",