GOOGLE TRANSLATOR French translation +

Some English sentences updated + code-style fix of update.class.php. Pls
rewiew the changed php and php.inc
files for eventual problems. First of all 'lib/class/update.class.php'
Because of database actions :smile:

And updated all lang catalogues and bins

French lang names are not translated. My thought is that translating the
langnames from English to French would result in big confusion.

If @arnaudbey or anyone else could write in #391 what translations are
wrong and write the corrected form under it, I will do the rest if it is
simpler for anyone.