title: rails 4 Uncaught TypeError: Cannot read property 'remove' of undefined
body: <p>In activeadmin with ckeditor field show error: 
  in chrome</p>
  
  <pre><code>Uncaught TypeError: Cannot read property 'remove' of undefined 
  </code></pre>
  
  <p>in ff</p>
  
  <pre><code>TypeError: d is undefined
  </code></pre>
  
  <p>indicates that string: </p>
  
  <pre><code>..].ltr?"ltr":"rtl"}});e.language_remove={label:d.remove,group:"language_remove",s...
  </code></pre>
  
  <p>Later everything worked. Launched bundle update, all work stopped</p>