Fix Revision model change in Wagtail 4.0

[zerolab]

this should cover:

• adding localize to a Wagtail 4 project
• upgrading a project using localize to Wagtail 4

Fixes #629

[zerolab]

@ArnarTumi any chance you could test this on your projects pip install git+https://github.com/wagtail/wagtail-localize.git@fix/pagerevision-revision-switcharoo-dance. Note that installing it this way won't have the compiled assets so the edit translation view will error. Should not matter as you're testing adding localize to an existing project. If you have any on pre 4.0, would be nice to try it on them too

cc @iscilyas in the context of #615 too

[codecov-commenter]

Codecov Report

Base: 91.77% // Head: 91.77% // No change to project coverage 👍

Coverage data is based on head (9b5802a) compared to base (51df05e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #630   +/-   ##
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  Coverage   91.77%   91.77%           
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  Files          46       46           
  Lines        3950     3950           
  Branches      596      596           
=======================================
  Hits         3625     3625           
  Misses        192      192           
  Partials      133      133           

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[ArnarTumi]

Hey @zerolab I was able to install this both on wagtail 4.0.2 and wagtail 2.15.5 so this seems to be working :)

[zerolab]

@gasman will merge this as is tomorrow mid-morning, unless I hear otherwise

[gasman]

LGTM! This looks like a very neat way of dealing with the unpredictability of the model name. I look forward to stealing it for wagtail-review :-)

[zerolab]

Thank you! it took quite some trial and error. Lots of TILs in the process. I am both in awe and somewhat mystified by the power of Django migrations