refs ea27e26b

This mostly reverts 5643a3b5 and
81e1a35c.

Thanks Carl Meyer for review.

Ensured squashed migrations are recorded as applied when the
migrate command is run and all of the original migrations
have been previously applied.

Thanks Simon Charette for review.

As of b11564fd it's no longer
used elsewhere in Django and it isn't a documented public API.

Thanks Simon Charette for review.

Fixed #25241 -- Corrected ModelForm.save() error message when saving invalid form with UUIDField pk.

Fixed in f59fd15c

Added django.views.i18n.json_catalog() view, which returns a JSON
response containing translations, formats, and a plural expression
for the specified language.

Thanks Anssi Kääriäinen for the draft text and Simon Charette
for review.

Correct test which was using the model field in a test form.

Unused since c2ba59fc (Django 1.0).

Thanks Andy Baker for the report.