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/routes.rb

@@ -86,6 +86,7 @@ Rails.application.routes.draw do
       resource :reset, only: [:create]
       resource :silence, only: [:create, :destroy]
       resource :suspension, only: [:create, :destroy]
+      resource :confirmation, only: [:create]
     end
   end