Yeah the french speaking community are very large and the vast majority of them don't know a thing in copywriting and are very poor in english. Making your software in french you will hit the european and the african market.
Their is a growing number of entrepreneur in africa, specialy in west africa , where french is dominant.
By translating you offer you will be the first to enter that market, you will be In front of funnelScript, in the new booming market.
So the decision is yours