Get the description of the object

        :param lang: Lang to retrieve
        :return: Description string representation
        :rtype: Literal

def get_description(self, lang: str=None) -> Literal:
        """ Get the description of the object

        :param lang: Lang to retrieve
        :return: Description string representation
        :rtype: Literal
        """
        return self.metadata.get_single(key=DC.description, lang=lang)