def translate(
        self, message: str, plural_message: str = None, count: int = None
    ) -> str:
        """Returns the translation for the given message for this locale.

        If ``plural_message`` is given, you must also provide
        ``count``. We return ``plural_message`` when ``count != 1``,
        and we return the singular form for the given message when
        ``count == 1``.
        """
        raise NotImplementedError()