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/ja.yml

@@ -123,10 +123,6 @@ ja:
       most_recent_ip: 直近のIP
       no_limits_imposed: 制限なし
       not_subscribed: 購読していない
-      order:
-        alphabetic: アルファベット順
-        most_recent: 直近の活動順
-        title: 順序
       outbox_url: Outbox URL
       perform_full_suspension: 完全に活動停止させる
       profile_url: プロフィールURL