fix: replace sed -i with perl -pi for macOS compatibility

[skjnldsv]

☑️ Resolves

• Fix Fix sed Command Compatibility Issue in add-lang-to-versions-template-% Target on macOS #13186

Summary

merge-folders in user_manual/Makefile used sed -i -e to rewrite
_images and _static paths in the built HTML. macOS BSD sed requires
a backup-extension argument with -i (e.g. sed -i ''), while GNU sed
does not accept an empty extension — there is no single flag spelling
that works on both.

Replace both invocations with perl -pi -e, which handles in-place
edits portably on Linux and macOS.

Before:

find ./ -type f -exec sed -i -e 's/_images/..\/_images/g' {} \;
find ./ -type f -exec sed -i -e 's/_static/..\/_static/g' {} \;

After:

find ./ -type f -exec perl -pi -e 's|_images|../_images|g' {} \;
find ./ -type f -exec perl -pi -e 's|_static|../_static|g' {} \;

Note: the add-lang-to-versions-template-% target mentioned in the
issue title was already removed in a prior refactor commit
(c40d359041). The remaining sed -i usage (in merge-folders) is
the last occurrence of this macOS-incompatible pattern.

🖼️ Screenshots

N/A — Makefile change only, no visual output affected.

✅ Checklist

• I have built the documentation locally and reviewed the output
• Screenshots are included for visual changes (N/A)
• I have not moved or renamed pages (or added a redirect if I did)
• I have run codespell or similar and addressed any spelling issues

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Last updated: Tue, 21 Jul 2026 08:20:30 GMT

[skjnldsv]

ping @alperozturk96 :)

[alperozturk96]

Tested. It works on macOS.

[skjnldsv]

/backport to stable34

[skjnldsv]

/backport to stable32

[skjnldsv]

/backport to stable33