@deconstructible
class NameValidator(object):
    def __call__(self, string: str) -> NoReturn:
        if not all(char in ascii_lowercase for char in string.lower()):
            raise ValidationError(
                _('Only Latin letters are allowed.')
            )


def name_validation(string: str) -> NoReturn:
    if not all(char in ascii_lowercase for char in string.lower()):
        raise ValidationError(
                _('Only Latin letters are allowed.')
            )