If you want to fix the translations, you've to head over to Transifex, create an account, and join a language team at the MediaPortal project. Your account should be approved in about a day, and then you can start changing translations. I usually update translations right before each release, but I've already packaged 0.5.3 so it'll end up in 0.5.4.
Or just ask @azzuro who's the manager for french translation to make the modification ;-)
edit : I guess that he's gonna receive a notification if I talk about him...
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