Admin UI for confirming users (#2245)

* Shows confirmed status in list.

* Adds ability to confirm users in admin UI.

* Added new english translations.

* Addresses feedback from #2245.

* More feedback.

config/locales/en.yml

@@ -43,6 +43,8 @@ en:
   admin:
     accounts:
       are_you_sure: Are you sure?
+      confirm: Confirm
+      confirmed: Confirmed
       display_name: Display name
       domain: Domain
       edit: Edit