Add custom `makemessages` command

[ddabble]

Proposed changes

Override the makemessages management command in order to do the following:

• Inject default --ignore options (0aea8e0b084feb9887486fe6f7142b91504316c1)
  • This is to avoid having the command iterate over files outside the Django source directory (src), like inside the node directory - which might contain a node_modules directory containing tens of thousands of files
• Make it automatically convert the path format of the file location comments in .po files generated on Windows, to the format generated on Linux - i.e. forward slashes (/) instead of backslashes (\) and no leading .\ (1b4685eb2a9b668724b706727979f900799d461a)
  • In other words, developers using Windows no longer have to do this manually after running the command :)

Areas to review closely

That the makemessages command produces the proper output.

Checklist

(If any of the points are not relevant, mark them as checked)

• [ ] Created tests that fail without the changes, if relevant/possible
• [x] Made sure that your code conforms to the code style guides and that any common code smells have been addressed
  • (It's not intended that you read through this whole document, but that you get yourself an overview over its contents, and that you keep it in mind while taking a second look at your code before opening a pull request)
• [x] Added sufficient documentation - e.g. as docstrings or in the README, if suitable
• [x] Added your changes to the "Unreleased" section of the changelog - mainly the changes that are of particular interest to users and/or developers, if any
• [x] Added a "Deployment notes" section above, if anything out of the ordinary should be done when deploying these changes to the server

[codecov[bot]]

Codecov Report

Merging #620 (d44f52d) into dev (ce12741) will decrease coverage by 0.47%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev     #620      +/-   ##
==========================================
- Coverage   87.70%   87.24%   -0.47%     
==========================================
  Files         134      135       +1     
  Lines        5644     5674      +30     
==========================================
  Hits         4950     4950              
- Misses        694      724      +30     

Impacted Files	Coverage Δ
src/web/management/commands/makemessages.py	0.00% <0.00%> (ø)

[ddabble]

Merging without explicit approval from another member, as the Dev committee agreed to merge these changes and assume they're relatively bug-free, simply to get things done quicker.