Hey Marc and thanks for getting in touch!
Yeah, WPML integration is something we’ve been working really hard on. In fact, it took quite a while for us just to get everything working well with The Events Calendar.
For the time being, we are working on getting more of our plugins–like Events Calendar PRO and Event Tickets–integrated as well, but we’ve learned that it requires WPML to make some changes as well and we’ve had to work closely with that team to pull some things off.
That said, I do not have a solid suggestion for selling tickets using a multilingual integration. I think this is an area that all calendar plugins need to improve on and we’re doing our best to keep on rolling out improved WPML integrations as we go.
Sorry I don’t have a better answer for you, but does at least help a bit? Please let me know if you have any follow-up questions here and I’d be happy to help as best I can.
Thanks so much,
Geoff