Update fr.js

I changed few things from :
https://github.com/dmapdm/unchecky-translate/commit/ea3c109e740b243d90bba6f766c373b609ac313f
(Note : the video in french in the page : http://unchecky.com/press is no longer avaible. You can use this one : https://www.youtube.com/watch?v=x4i9nGuYvII)