Get the DC description of the object

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

def get_description(self, lang=None):
        """ Get the DC description of the object

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