Do not require programs languages in controller

We did not set this in ProposalController#create so it was empty
if we the event validation failed and we rendered :new.

It makes little sense to assign this instance variable anyway, we already have
@program.

app/controllers/admin/events_controller.rb

@@ -57,7 +57,6 @@ module Admin
       @comment_count = @event.comment_threads.count
       @user = @event.submitter
       @url = admin_conference_program_event_path(@conference.short_title, @event)
-      @languages = @program.languages_list
     end
 
     def comment
@@ -71,7 +70,6 @@ module Admin
     end
 
     def update
-      @languages = @program.languages_list
       if @event.update(event_params)
 
         if request.xhr?
@@ -89,7 +87,6 @@ module Admin
 
     def create
       @url = admin_conference_program_events_path(@conference.short_title, @event)
-      @languages = @program.languages_list
       @event.submitter = current_user
 
       if @event.save
@@ -102,7 +99,6 @@ module Admin
 
     def new
       @url = admin_conference_program_events_path(@conference.short_title, @event)
-      @languages = @program.languages_list
     end
 
     def accept