Redesign admin accounts index (#9340)

* Improve overview of accounts in admin UI

- Display suspended status, role, last activity and IP prominently
- Default to showing local accounts
- Default to not showing suspended accounts

* Remove unused strings

* Fix tests

* Allow filtering accounts by IP mask

config/locales/zh-CN.yml

@@ -114,10 +114,6 @@ zh-CN:
       most_recent_activity: 最后一次活跃的时间
       most_recent_ip: 最后一次活跃的 IP 地址
       not_subscribed: 未订阅
-      order:
-        alphabetic: 按字母
-        most_recent: 按时间
-        title: 排序
       outbox_url: 发件箱（Outbox）URL
       perform_full_suspension: 永久封禁
       profile_url: 个人资料页面 URL