Hello,
1/ Do you have this issue during checkout on your site? We did not find any simple product to add to cart and proceed to checkout.
2/ WooCommerce does not have all these fields during registration http://prntscr.com/qxztqd
How did you add them: using an additional plugin or by additional customization?
3/ Yes, we have partial French translation https://github.com/OlgaBarlow/Translation-of-Xstore-theme/tree/master/Xstore
Don’t forget to update translation files after uploading to your server https://xstore.helpscoutdocs.com/article/103-translation-files-update
Regards