chore: support localize

Author: appflowy

frontend/app_flowy/assets/translations/en.json

@@ -221,5 +221,10 @@
       "timeHintTextInTwelveHour": "12:00 AM",
       "timeHintTextInTwentyFourHour": "12:00"
     }
+  },
+  "board": {
+    "column": {
+      "create_new_card": "New"
+    }
   }
-}
+}

frontend/app_flowy/lib/plugins/board/presentation/board_page.dart

@@ -2,13 +2,15 @@
 
 import 'dart:collection';
 
+import 'package:app_flowy/generated/locale_keys.g.dart';
 import 'package:app_flowy/plugins/board/application/card/card_data_controller.dart';
 import 'package:app_flowy/plugins/grid/application/row/row_cache.dart';
 import 'package:app_flowy/plugins/grid/application/field/field_cache.dart';
 import 'package:app_flowy/plugins/grid/application/row/row_data_controller.dart';
 import 'package:app_flowy/plugins/grid/presentation/widgets/cell/cell_builder.dart';
 import 'package:app_flowy/plugins/grid/presentation/widgets/row/row_detail.dart';
 import 'package:appflowy_board/appflowy_board.dart';
+import 'package:easy_localization/easy_localization.dart';
 import 'package:flowy_infra/image.dart';
 import 'package:flowy_infra/theme.dart';
 import 'package:flowy_infra_ui/style_widget/text.dart';
@@ -169,7 +171,7 @@ class _BoardContentState extends State<BoardContent> {
           ),
         ),
         title: FlowyText.medium(
-          "New",
+          LocaleKeys.board_column_create_new_card.tr(),
           fontSize: 14,
           color: context.read<AppTheme>().textColor,
         ),