Tests: Language chooser middleware warning during tests

[JacobCoffee]

Investigate separately these non-failing warnings

......................../usr/local/lib/python3.12/site-packages/admin_interface/templatetags/admin_interface_tags.py:29: UserWarning: Language chooser requires 'django.middleware.locale.LocaleMiddleware' in your MIDDLEWARE to work.
  warnings.warn(
............................................................/usr/local/lib/python3.12/site-packages/admin_interface/templatetags/admin_interface_tags.py:29: UserWarning: Language chooser requires 'django.middleware.locale.LocaleMiddleware' in your MIDDLEWARE to work.
  warnings.warn(
../usr/local/lib/python3.12/site-packages/admin_interface/templatetags/admin_interface_tags.py:29: UserWarning: Language chooser requires 'django.middleware.locale.LocaleMiddleware' in your MIDDLEWARE to work.
  warnings.warn

Originally posted by @JacobCoffee in #2741 (comment)