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/es.yml

@@ -123,10 +123,6 @@ es:
       most_recent_ip: IP más reciente
       no_limits_imposed: Sin límites impuestos
       not_subscribed: No se está suscrito
-      order:
-        alphabetic: Alfabético
-        most_recent: Más reciente
-        title: Orden
       outbox_url: URL de bandeja de salida
       perform_full_suspension: Suspender
       profile_url: URL del perfil