So this is actually a bug from the Fest Theme, since it is supposed to work with wpml and it doesn't.
Since I don't have a developer license I cannot submit a ticket, so I don't know how to proceed.
I've tried it many ways, and I also tried it with a clean install, two times actually.
The bug is simple, the Speaker category although it seems to be translatable, cannot be translated.
Here is what I done:
Install a fresh install quick start. Install wpml, setup 4 language with wpml. Make sure the custom post speakers is translated in translation management, multilingual setup.
Setup wpml to appear in the menu.
I went to Category in the speaker menu, translated in 4 languages. Then I translated the 8 speakers in the 4 language.
Now when visiting the Speaker page, I cannot change language on that page. This is a local install so I don't have a link to it.
I would really like to have this solve as it is a major problem on a theme that is supposed to work with wpml. How can I proceed forward with this bug?