Only the physical products need to be in french. The reason behind this is that an employee that doesn't know a word of english has to be able to use all the tools without having to ask for a french version (a french speaking employee in a workplace where the management is english speaking may get discriminated against otherwise).

My keyboard is french, but its layout is english and so is my OS and all my softwares. However, I had to change the language myself since everything come out of the box as french.