Hello,
1) Cart is translated http://prntscr.com/pno55l Don’t see problems with this.
2) What theme version did you use before the update? Looks it was too old version and you need to re-create pages because WPBakery page builder changed the shortcodes structure in one of the old updates. We have fixed you this page layout http://www.coach-relooking.fr/relooking-nouveau-style/ Edit other pages to resolve problem.
3) We don’t see any Fatal error on the shop page http://prntscr.com/pno5wb .
Regards