Meta: Adapt django makemessages command to ensure forward slashes

This adapts submethods of the makemessages command to use generic forward slashes instead of os specific slashes, e.g., backslashes on windows

changed milestone to %KIF 50,7

added meta label

requested review from @ngeisler

mentioned in merge request !137 (merged)

added 17 commits

• 42277fcf...1647b9d4 - 16 commits from branch main
• 8686adbb - Adapt django makemessages command to ensure forward slashes

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approved this merge request

mentioned in commit bfc5198b

merged