little translation to send invitations

app/controllers/invitations_controller.rb

@@ -51,7 +51,7 @@ class InvitationsController < ApplicationController
     inviter = EmailInviter.new(params[:email_inviter][:emails], current_user, params[:email_inviter])
     inviter.send!
 
-    redirect_to :back, :notice => "Great! Invites were sent off to #{inviter.emails.join(', ')}"
+    redirect_to :back, :notice => "#{t('invitations.create.sent')} #{inviter.emails.join(', ')}"
   end
 
   def check_if_invites_open
@@ -61,4 +61,4 @@ class InvitationsController < ApplicationController
       redirect_to :back
     end
   end
-end
\ No newline at end of file
+end