Hello Willy,
Error "pip_install_from_wheels returned code 1" is likely caused by a non-ASCII character in Cloud SDK's path, or in a parameter of the gcloud command. It seems likely that one of the accented characters in French causes the error. You may find related information in the "Google App Engine Python 3.7 build error: `pip_download_wheels` returned code: 1" question in StackOverflow, as an example among others in StackOverflow.
All this is above the scope of this discussion group, in fact off-topic. You should post such questions to StackOverflow, or other similar forums. This forum meant for general discussion on the platform and its services. By contrast, in StackOverflow, you get in contact with experienced programmers, who are happy to help.