Get languages used in the project with percentage value.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabGetError: If the server failed to perform the request

def languages(self, **kwargs):
        """Get languages used in the project with percentage value.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabGetError: If the server failed to perform the request
        """
        path = '/projects/%s/languages' % self.get_id()
        return self.manager.gitlab.http_get(path, **kwargs)