fix(flutter): 评论输入增加登录闸

lib/l10n/app_localizations_zh.dart

@@ -443,6 +443,9 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get writeComment => '写评论';
 
+  @override
+  String get commentLoginHint => '登录后参与评论';
+
   @override
   String get postComment => '发布';