fix(player): 增加退出清屏浮动按钮

lib/l10n/app_localizations_en.dart

@@ -136,6 +136,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get clearScreen => 'Clear screen';
 
+  @override
+  String get exitClearScreen => 'Exit clear screen';
+
   @override
   String minutesAgo(int count) {
     return '$count min ago';