Your CS degree is more likely to provide career opportunities than your degree in French. So my advice would be to focus on schools that are strong in CS, where you can also take the language courses that interest you and do a study abroad in France (or Germany – though honestly, as someone who is fluent in several languages, I can tell you that if you want to achieve fluency, you should pick one or the other to focus on at this stage; if you’re going to do four years of French in HS, I’d say continue with that), rather than focusing on a school that has a great foreign languages program or even trying to find one that is half-way between the two.