Good evening Paco and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
The short answer is that Polylang Pro is compatible with the Events Calendar free plugin, but not with the Events Calendar Pro. At least not yet.
That means that recurring events support is not yet officially offered for Polylang Pro.
With that in mind, I would recommend reaching out to the community and searching the web because, there are several of our customers that have been able to achieve great things with Polylang and our plugins (via some tweaks).
I wish I had a better answer for you, but for now it’s the best one I have unfortunately.
Best regards,
Geoff B.