Return the complete list of translation objects of a Translatable
        instance

        @type lang: string
        @param lang: a string with the name of the language

        @rtype: list of Translation
        @return: Returns a list of translations objects

def translations_objects(self, lang):
        """
        Return the complete list of translation objects of a Translatable
        instance

        @type lang: string
        @param lang: a string with the name of the language

        @rtype: list of Translation
        @return: Returns a list of translations objects
        """
        return Translation.objects.filter(
            object_id=self.id,
            content_type=ContentType.objects.get_for_model(self),
            lang=lang
        )