Improve admin UI for accounts (#7360)

* Improve design of account statuses admin UI (consistent with reports)

* Make account moderation notes look consistent with report notes

* i18n-tasks remove-unused

* Fix code style issues

* Fix tests

config/locales/zh-TW.yml

@@ -80,7 +80,6 @@ zh-TW:
     reports:
       comment:
         none: 無
-      delete: 刪除
       id: ID
       mark_as_resolved: 標記為已解決
       report: '檢舉 #%{id}'