feat: update zh_TW.json (#225)

ui/flutter/assets/locales/zh_TW.json

@@ -41,7 +41,7 @@
   "theme": "佈景主題",
   "themeSystem": "跟隨系統",
   "themeLight": "亮色主題",
-  "themeDark": "暗色主題",
+  "themeDark": "深色主題",
   "locale": "語言",
   "about": "關於",
   "homepage": "訪問主頁",
@@ -60,4 +60,10 @@
   "newVersionTitle": "發現新版本 @version",
   "newVersionUpdate": "立刻更新",
   "newVersionLater": "稍後更新"
+  "extensions": "外掛程序",
+  "extensionInstallUrl": "安裝鏈接",
+  "extensionInstallSuccess": "安裝完成",
+  "extensionUpdateSuccess": "更新完成",
+  "extensionDelete": "解除安裝",
+  "extensionAlreadyLatest": "已是最新版本"
 }