Plugin translation

On my wordpress website http://www.agence-immobiliere-floride.com , I use a plugin to display real estate in Florida to french customers. The problem is that everything is in English and I would like to translate it in French : for example, change Bedroom to Chambres or Town to Ville.
Is there a way to do that simply without going into the code because I dont’ want to lose everything when there is a plugin update.
If I can’t do that by myself (If it seems to complicated to me, I know how to modify the code, but I can’t do a plugin for example), I’m ok to pay for that.
Thanks.