Secondly, In a dropdownmenu, In Conditional option, I search which language is in user database ( en_us, fr_fr, it_it,es_es … ) and use it as a condition to change the values of the option caption of the dropdown menu.
Yes I found a solution.
1st : Language code must be saved in user data : fr_fr en_us, it_it, de_de …
2nd : I decided to “send” this data in the URL adress, everytime the user opens a new page.
In workflow :