Get the DC Creator literal value

        :param lang: Language to retrieve
        :return: Creator string representation
        :rtype: Literal

def get_creator(self, lang=None):
        """ Get the DC Creator literal value

        :param lang: Language to retrieve
        :return: Creator string representation
        :rtype: Literal
        """
        return self.metadata.get_single(key=DC.creator, lang=lang)