Comment by sbegaudeau

I'm also a French developer and I have delivered projects used by French customers in the public sector and it really depends. I have worked for/with French public sector customers on open source projects in popular open source foundations where everything is in English (code, comments, user manual, etc) with a regular open source license but I also know of teams in public sector customers where everything they build has to be in French including the code itself. Ask your customer.