def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
async def get_user_language(self, obj):
        """
        You need to override this method and return user language
        """
        raise NotImplementedError