With Symfony 1.2 the creation of I18n admin interface has changed.[[BR]]
It's very simple: if you have an Article model, just add to your !ArticleForm:

{{{
class ArticleForm extends BaseArticleForm
{
  public function configure()
  {
    $this->embedI18n(array('en', 'fr'));
  }
}
}}}

and you can change the language labels with:

{{{
    $this->widgetSchema->setLabel('en', 'English');
    $this->widgetSchema->setLabel('fr', 'French');
}}}

for reference take a look at [http://www.symfony-project.org/book/forms/1_2/en/08-Internationalisation-and-Localisation#Propel%20Objects%20Internationalization Form I18n]