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-TW.yml

@@ -108,10 +108,6 @@ zh-TW:
       most_recent_activity: 最近活動
       most_recent_ip: 最近 IP 位址
       not_subscribed: 未訂閱
-      order:
-        alphabetic: 按字母
-        most_recent: 按時間
-        title: 排序
       outbox_url: 寄件箱 (Outbox) URL
       perform_full_suspension: 進行停權
       profile_url: 個人檔案 URL