chore(l10n): 清理已移除语言入口文案

lib/l10n/app_zh.arb

@@ -83,7 +83,6 @@
   "completed": "已看完",
   "noSavedShows": "这里还没有剧集。",
   "preferences": "偏好设置",
-  "appLanguage": "应用语言",
   "followingTab": "关注",
   "animatedTab": "漫剧",
   "recommendedTab": "推荐",
@@ -207,8 +206,6 @@
   "captionsOff": "关闭字幕",
   "englishCaptions": "英文字幕",
   "chineseCaptions": "简体中文字幕",
-  "language": "界面语言",
-  "systemLanguage": "跟随系统",
   "english": "English",
   "simplifiedChinese": "简体中文",
   "bahasaIndonesia": "印尼语",
@@ -494,10 +491,6 @@
   "qualityAuto": "自动",
   "qualityAutoHint": "HLS 会根据当前网络自动切换码率。",
   "searchFailed": "搜索失败，请重试。",
-  "languageFilter": "语言",
-  "languageChinese": "中文",
-  "languageIndonesian": "印尼语",
-  "languageEnglish": "英语",
   "searchResultCount": "{count} 个结果",
   "@searchResultCount": { "placeholders": { "count": { "type": "int" } } }
 }