Model with page foreign key

class WorldPart(models.Model):
    from cms.models import Page

    name_ru = models.CharField(max_length=255, verbose_name=_('Name RU'), null=True, blank=True)
    prepositional_ru = models.CharField(max_length=255, verbose_name=_('Prepositional Name RU'), null=True, blank=True)
    name_en = models.CharField(max_length=255, verbose_name=_('Name EN'), null=True, blank=True)
    page = models.ForeignKey(Page)