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/eu.yml

@@ -123,10 +123,6 @@ eu:
       most_recent_ip: Azken IP-a
       no_limits_imposed: Ez da mugarik ezarri
       not_subscribed: Harpidetu gabe
-      order:
-        alphabetic: Alfabetikoa
-        most_recent: Azkena
-        title: Ordena
       outbox_url: Irteera ontziaren URL-a
       perform_full_suspension: Kanporatu
       profile_url: Profilaren URL-a