You need a headlamp converter, beacuse the beam pattern "kicks-up" to one side to light up the pavement - and in France it will be the wrong side!
Also you may find you need to change the colour of the beam - best to check on the rules, then see what you can get. Not sure if a proprietary converter (Halford's stick-on for about a fiver) will do it, or whether your headlamps need something a bit special.