You will need to install FR translation file from Transifex
Look for mod_competition_competitions, download it and copy to /language folder of your Joomla installation.
You can get our help: Monday - Friday / 09:00 to 17:00 (GMT+2). but not limited. Our staff will be pleased to provide Premium support to every paid subscriber asap, but sometimes you should be ready to wait for our reply for up to 3 days. In case of free extensions we do the best to develop and maintain them either, but their support is not necessary.