feat(flutter): 统一文字下拉刷新

lib/l10n/app_localizations_zh.dart

@@ -668,6 +668,15 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get retry => '重试';
 
+  @override
+  String get pullToRefresh => '下拉刷新';
+
+  @override
+  String get releaseToRefresh => '松手刷新';
+
+  @override
+  String get refreshingLabel => '正在刷新…';
+
   @override
   String get backToSeries => '返回剧集详情';