Make parameter type names consistent(ly French)

Cool app James~!

I just noticed while browsing `app.js` you had adopted the convention of describing your parameter names in French:

![image](https://cloud.githubusercontent.com/assets/1994486/5400476/f1052e36-81d8-11e4-85df-e6cf32269fc5.png)

But it seemed like you forget to get les deux nombres parameters on the other functions, so basically I got your back is what I'm saying. :ok_hand: