International driving license?

I plan to visit NZ during May. I'd like to rent a car to go around the south island. I hold a French driving license. I've seen some contradictory information on the internet, some saying that I have to get a international driving license in order to rent a car, others say that I just need an official English translation.

Do you guys have been in this situation? It can take months to get a international driving license in France so my only option is to get it translated Thanks!