Andrew

Remove usage of `ugettext_lazy`

1

apps.py module contains import of `ugettext_lazy` function which has been removed in django 4.0. Please replace it with `gettext_lazy`

tz_isoformat works wrong with datetime.timezone.utc

1

There is an issue with replacing of tz info from +00:00 to Z. [timezone.dst(dt) Always returns None.](https://docs.python.org/3.9/library/datetime.html#datetime.timezone.dst) ```python import isodate import pytz from datetime import datetime, timezone timezone_datetime = datetime.now(tz=timezone.utc)...