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What this PR does
The main purpose is to define the default_auto_field explicitly, in line with the 3.2 release notes here https://docs.djangoproject.com/en/4.0/releases/3.2/#customizing-type-of-auto-created-primary-keys
This prevents an extra migration being required in the event that this app is included in a project which defines a default_auto_field of anything other than 'django.db.models.AutoField'
Perhaps BigAutoField is a better choice here, in which case this app would need to be shipped with the supporting migration - I shall leave that up to the authors, but this should work as is, without changing any existing deployments.
Other changes are limited to strictly those required to support the unit tests passing locally, specifically:
ugettext_lazy
having apparently moved in 4.X and hence a failing importruntests.py
tests/apps.py
for explicitly setting default_auto_field to suppress warnings during test running