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/no.yml

@@ -92,10 +92,6 @@
       most_recent_activity: Nyligste aktivitet
       most_recent_ip: Nyligste IP
       not_subscribed: Ikke abonnért
-      order:
-        alphabetic: Alfabetisk
-        most_recent: Nyligst
-        title: Rekkefølge
       outbox_url: Utboks URL
       perform_full_suspension: Utfør full utvisning
       profile_url: Profil-URL