The translation domain is a new feature that was merged a few days ago.

Basically we can now set the translation_domain on either a form group
or individual fields.

Setting it on the form group, as in this example, will cascade the TD
down to the individual fields.

On Thu, Jun 06, 2013 at 02:59:21AM -0700, Lukas Kahwe Smith wrote:
>    In Admin/Extension/PublishWorkflowExtension.php:
> 
>  > + * Admin extension to add publish workflow fields.
>  > + *
>  > + * @author Daniel Leech <daniel@dantleech.com>
>  > + */
>  > +class PublishWorkflowExtension extends AdminExtension
>  > +{
>  > +    public function configureFormFields(FormMapper $formMapper)
>  > +    {
>  > +        $dateOptions = array(
>  > +            'empty_value' => '',
>  > +            'required' => false,
>  > +        );
>  > +
>  > +        $formMapper->with('form.group_publish_workflow', array(
>  > +            'translation_domain' => 'CmfCoreBundle'
>  > +        ))
> 
>    this looks strange.
> 
>    —
>    Reply to this email directly or [1]view it on GitHub.
> 
> References
> 
>    Visible links
>    1. https://github.com/symfony-cmf/CoreBundle/pull/44/files#r4564312