title: Translate select options in Symfony2 class forms
body: <p>I'm using a class form in Symfony2 Beta3 as follows:</p>
  
  <pre><code>namespace Partners\FrontendBundle\Form;
  
  use Symfony\Component\Form\AbstractType;
  use Symfony\Component\Form\FormBuilder;
  
  class ConfigForm extends AbstractType
  {
      public function buildForm(FormBuilder $builder, array $options)
      {
          $builder-&gt;add('no_containers', 'choice', array('choices' =&gt; array(1 =&gt; 'yes', 0 =&gt; 'no')));
          ...
  </code></pre>
  
  <p>I want to translate the 'yes' and 'no' options, but I don't know how to use the translator here.</p>