chore(l10n): 清理已移除语言入口文案

lib/l10n/app_localizations.dart

@@ -490,12 +490,6 @@ abstract class AppLocalizations {
   /// **'Preferences'**
   String get preferences;
 
-  /// No description provided for @appLanguage.
-  ///
-  /// In en, this message translates to:
-  /// **'App Language'**
-  String get appLanguage;
-
   /// No description provided for @followingTab.
   ///
   /// In en, this message translates to:
@@ -1060,18 +1054,6 @@ abstract class AppLocalizations {
   /// **'Chinese captions'**
   String get chineseCaptions;
 
-  /// No description provided for @language.
-  ///
-  /// In en, this message translates to:
-  /// **'Language'**
-  String get language;
-
-  /// No description provided for @systemLanguage.
-  ///
-  /// In en, this message translates to:
-  /// **'System'**
-  String get systemLanguage;
-
   /// No description provided for @english.
   ///
   /// In en, this message translates to:
@@ -2434,30 +2416,6 @@ abstract class AppLocalizations {
   /// **'Search failed. Please try again.'**
   String get searchFailed;
 
-  /// No description provided for @languageFilter.
-  ///
-  /// In en, this message translates to:
-  /// **'Language'**
-  String get languageFilter;
-
-  /// No description provided for @languageChinese.
-  ///
-  /// In en, this message translates to:
-  /// **'Chinese'**
-  String get languageChinese;
-
-  /// No description provided for @languageIndonesian.
-  ///
-  /// In en, this message translates to:
-  /// **'Indonesian'**
-  String get languageIndonesian;
-
-  /// No description provided for @languageEnglish.
-  ///
-  /// In en, this message translates to:
-  /// **'English'**
-  String get languageEnglish;
-
   /// No description provided for @searchResultCount.
   ///
   /// In en, this message translates to: