Co-authored-by: Petr Dlouhy <petr.dlouhy@email.cz>
Co-authored-by: Olivier Dalang <olivier.dalang@gmail.com>

Thanks Simon Charette, Jon Dufresne, and Tim Graham for the reviews.

Fixed #29392 -- Disallowed use of abbreviated forms of --settings and --pythonpath management command options.

Follow up to 1b7d524c.

Follow-up of d97cce34 and 7d3fe36c.

Follow up to ac59ec8f.

The implementations have unintentionally diverged.

Fixed #27629 -- Added router.allow_relation() calls for assignments between unsaved model instances.

Thanks Tim Graham for the review.

The problem:
“3 days ago” should translate to “vor 3 Tagen” in German, while “3 days” translates to “3 Tage”. #21408 describes that django always translated to “Tage”, even when the dative “Tagen” was correct. The same applies to months (“Monate”/“Monaten”) and years (“Jahre”/“Jahren”).

The solution:
Let `timesince` caller provide the string dict to use for the time-related strings.

Thanks Tim Graham for the review.

Fixed #28913 -- Fixed error handling when MIGRATIONS_MODULES specifies a nonexistent top-level package.

* Added logging of 500 responses for instantiated responses.
* Added logging of all 4xx and 5xx responses.