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

app/controllers/proposals_controller.rb

@@ -23,12 +23,10 @@ class ProposalsController < ApplicationController
   def new
     @user = User.new
     @url = conference_program_proposals_path(@conference.short_title)
-    @languages = @program.languages_list
   end
 
   def edit
     @url = conference_program_proposal_path(@conference.short_title, params[:id])
-    @languages = @program.languages_list
   end
 
   def create

app/views/proposals/_form.html.haml

@@ -32,7 +32,7 @@
 - if @program.languages.present?
   .form-group
   = f.label :language
-  = f.select :language, @languages, { include_blank: false}, { class: 'select-help-toggle form-control' }
+  = f.select :language, @program.languages_list, { include_blank: false}, { class: 'select-help-toggle form-control' }
 = render 'shared/select_help_text', f: f, for: :event_type_id, options: @conference.program.event_types do |event_type|
   = event_type.description
 - if display_details