Update zh_TW.json (#840)

Update TW language.

src/i18n/zh_TW.json

@@ -1,5 +1,5 @@
 {
-  "i18n.languageName": "繁體中文（台灣）",
+  "i18n.languageName": "繁體中文（臺灣）",
   "i18n.languageNameEnglish": "Trad. Chinese (Taiwan)",
   "i18n.category": "main",
   "i18n.authors": "@maikirakiwi @jay900604 @kyw504100 @BillKerman",
@@ -199,6 +199,13 @@
   "action.newpreset": "新增預設",
   "action.deletepreset": "刪除預設",
   "action.open": "開啟",
+  "action.cast.chromecast": "Chromecast",
+  "action.cast.todevices": "投射到裝置",
+  "action.cast.stop": "停止投射到所有裝置",
+  "action.cast.airplay": "AirPlay",
+  "action.cast.airplay.underdevelopment": "AirPlay 仍處於開發階段中，敬請期待。",
+  "action.cast.scan": "尋找",
+  "action.cast.scanning": "尋找中...",
   "settings.header.general": "一般",
   "settings.header.general.description": "調整 Cider 的一般設定",
   "settings.option.general.resumebehavior": "還原行為",