Good afternoon Gilbert and welcome back!
Thank you for reaching out to us and for sharing a solution to your previous issues for everyone’s benefit.
We are sorry to hear about the issues you have encountered
I would love to help you with this topic.
I believe your issue comes from some of the elements being translated in your slug. This depends on a couple of things, including what you translated or not in WPML’s string translation.
You are right. does not work, https://news.swissinformatics.org/fr/events/community/add but https://news.swissinformatics.org/fr/events/community/ajouter works!
Let me know if that helps.
Have a great day!
Geoff B.