Documents are always in user language

Frappe Framework Bug
1

Documents are always using the user language instead of the language defined on customer or supplier. I’m on
ERPNext: v11.1.39 (master)

Frappe Framework: v11.1.36 (master)

2

Has anybody the same issue? When I generate a sales order for example this doc is always in my user language (EN) instead of language defined on customer (FR for example)