[fr] Translate the 7 last news.

Hi, 

I tried to catch up the late on the french translation.

I translated the 7 last news including Ruby 2.2.

It will be very cool to have a review of my proposals.

Thanks.

n.b: I hope so much that REXML bugs are closed :stuck_out_tongue_closed_eyes: :gun: 

cc: @stomar, @chatgris 
The reference has been changed in the `en` post.