Switch to using six.python_2_unicode_compatible().
Review Request #11625 — Created May 26, 2021 and submitted
Django used to provide a
was then adopted into
sixand folded back into Django's copy.
Since modern versions of Django no longer provide the legacy version of
this decorator, this change moves the codebase to using the one in
Unit tests pass on Django 1.11 and on 3.2 (with other in-progress changes).