title: Change citation style in Ckeditor
body: <p>I would like to change the citation style in Ckeditor when we click on the button in the editor.
  I would like that when we click on this button it creates the following code :</p>
  
  <pre><code>&lt;div class="blockquote-guillemets"&gt;
          My text
  &lt;/div&gt;
  </code></pre>
  
  <p>Have you an idea ?</p>