title: Translate month in Symfony 2 date field
body: <p>I'm working on SF2 2.6.4 project.
  I created a form and added a date type component (birthday field type to be precise).</p>
  
  <p>I set it like that :</p>
  
  <pre><code>'widget'    =&gt; 'choice',
  'format'    =&gt; 'ddMMMMyyyy',
  </code></pre>
  
  <p>Format output</p>
  
  <pre><code>18 March 2015
  </code></pre>
  
  <p>I would like to translate month.</p>
  
  <p>During my research, I saw that <code>Symfony\Component\Form\Extension\Core\Type\DateType</code> class set a formatter with the hardcoded <code>\Locale::getDefault()</code> variable system.</p>
  
  <p>So is there a way to do what I want ?
  Is it a better idea to change my date format ?</p>
  
  <p>Thx</p>