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/sk.yml

@@ -113,10 +113,6 @@ sk:
       most_recent_activity: Posledná aktivita
       most_recent_ip: Posledná IP
       not_subscribed: Nezaregistrované
-      order:
-        alphabetic: Abecedne
-        most_recent: Podľa času
-        title: Zoradiť
       outbox_url: URL poslaných
       perform_full_suspension: Suspendovať
       profile_url: URL profilu