[LaTeX] For 'lualatex' with French, use babel LaTeX package as default, as for 'xelatex', and not polyglossia.

[jfbu]

Fix #12410

As I consider this a bugfix I did not register it as an "incompatible change" in CHANGES. I think French Sphinx 'lualatex' users either do not care or have their conf.py already set to use the babel LaTeX package.

[n-peugnet]

+1
I use babel with 'lualatex' in French Sphinx doc since 2 years and did not notice any issue, but I don't remember why I made this choice to begin with, and my commit message is not helpful 😅

[jfbu]

Your commit message does say indeed "Use for sure babel" 😃. The most visible change I think is in the rendering of lists, which adhere more closely with babel to French typographical standards.

[n-peugnet]

The most visible change I think is in the rendering of lists

Ah yes! You're right, I remember now.