> I agree that arrow's multi-locale natural language renderer does add a lot of value. Although I'd argue it should be unbundled into its own module

http://babel.pocoo.org/en/latest/api/dates.html

humanize is apparently a human-readable directioned delta, so that'd be format_timedelta(delta, add_direction=True)

    >>> print format_timedelta(ref - datetime.now(), add_direction=True)
    1 hour ago
    >>> print format_timedelta(ref - datetime.now(), add_direction=True, locale='zh')
    1小时前
    >>> print format_timedelta(ref - datetime.now(), add_direction=True, locale='ru')
    1 час назад