feat: Backport cms 4.0.x - Django 3.2 with Python 3.8 & 3.9 support, including update tooling

[Aiky30]

Description

Describe:

• Ported changes made in the main branch to the cms v4 supported branch.
• Removed all py2 # -- coding: utf-8 --
• Removed six imports
• Removed __future__ declaration
• Removed @python_2_unicode_compatible
• replaced ugettext with gettext, ugettext_lazy with gettext_lazy, and ungettext with ngettext
• replaced force_text() with force_str(), https://docs.djangoproject.com/en/3.2/ref/utils/#django.utils.encoding.force_text
• moved from django.conf.urls.url() to django.urls.re_path()

References

Changes ported from: 05c93d5

Checklist

• I have read the contribution guide
• Code lint checked via inv lint
• changes file included (see docs)
• Usage documentation added in case of new features
• Tests added

[coveralls]

Coverage increased (+95.5%) to 95.506% when pulling 774ff10 on Aiky30:feature/cms4-support-update-tooling into 9846374 on nephila:support/4.0.x.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (support/4.0.x@9846374). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 774ff10 differs from pull request most recent head acc9942. Consider uploading reports for the commit acc9942 to get more accurate results

@@               Coverage Diff                @@
##             support/4.0.x      #70   +/-   ##
================================================
  Coverage                 ?   94.44%           
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  Files                    ?        8           
  Lines                    ?      180           
  Branches                 ?       22           
================================================
  Hits                     ?      170           
  Misses                   ?        8           
  Partials                 ?        2           

Flag	Coverage Δ
unittests	94.44% <0.00%> (?)

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[joshyu]

Hi @Aiky30 ,
Is this PR still in progress?
I want to add Django4.2 support based on your PR.

[Aiky30]

Hi @joshyu,

Sadly this was never accepted by Nephila. This is potentially an issue because any changes that you make would only compound the sheer amount of changes.