Symfony2 - Set translation domain for a whole form

Symfony2 - Set translation domain for a whole form

I want to translate a form created with symfony's formbuilder. As i don't
want one big translation file it is splitted up into "domains".
Now i have to specify the translation_domain for each form-field,
otherwise symfony will look in the wrong file. This option has to be added
to every field and i'm wondering if there is a way to set this option to a
whole form?
Sample code i'm not happy with:
$builder->add(
'author_name',
'text',
array('label' => 'Comment.author_name', 'translation_domain' =>
'comment')
)->add(
'email',
'email',
array('label' => 'Comment.email', 'translation_domain' => 'comment')
)->add(
'content',
'textarea',
array('label' => 'Comment.content', 'translation_domain' => 'comment')
);