Can't override article resource

Hi, 

I try to override the article resource, but I get following error : 
`Neither the property "translations" nor one of the methods "translations()", "gettranslations()"/"istranslations()"/"hastranslations()" or "__call()" exist and have public access in class "Symfony\Component\Form\FormView"`

It seems that ArticleTranslation is not managed as a resource by Sylius.

