0h la la ! Will you forgive me? I shouted victory too quickly and did not check everything ... in fact the most important.
I get the right page layout, but the comment is not registered! The "#" seems important. but if I keep it, I do not get the right layout! Probably my idea is not the right one.
May I ask again for your help?
The donation (my second one) is already on its way.
Here I am again, after a long silence due to too much work.
To finish this discussion, I would like to inform you, that after my attempts, using among others your suggestions, I finally rebuilt my site in order to use Zenpage. It solved the multilingual issue. Zenpage is GREAT !