title: 'WSGIRequest' object has no attribute 'LANGUAGE_CODE'
body: <p>When I disable
  <code>cms.middleware.multilingual.MultilingualURLMiddleware</code></p>
  
  <p>I have
  Caught an exception while rendering <code>'WSGIRequest' object has no attribute 'LANGUAGE_CODE'</code>
  when edit pages, or use <code>{% show_menu_below_id %}</code> tag.</p>
  
  <p>I don't need lang prefix please, help me disable this stuff.</p>