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.

app/models/user.rb

@@ -19,6 +19,10 @@ class User < ApplicationRecord
   scope :admins,    -> { where(admin: true) }
   scope :confirmed, -> { where.not(confirmed_at: nil) }
 
+  def confirmed?
+    confirmed_at.present?
+  end
+
   def send_devise_notification(notification, *args)
     devise_mailer.send(notification, self, *args).deliver_later
   end