Fixed small spelling mistakes in French translation

"égal" as an adjective is without '-e' (unless feminine), and "finit" as a verb takes a '-t'.
Also, there should probably be a space before ':' (in "De :" and "À :"), but you could choose differently on that one so I leave it to you.
Merge pull request #642 from mdevulpillieres/patch-1

Fixed small spelling mistakes in French translation