Update/Cleanup french translations

Signed-off-by: Jerome Flesch <jflesch@gmail.com>
Merge branch 'testing' of github.com:jflesch/paperwork into testing
GLib.unix_signal_add may require 4 arguments instead of just 3

Signed-off-by: Jerome Flesch <jflesch@gmail.com>
Utils: localize.sh: check the value returned by the utilities used in the script (msgfmt, msginit, msgmerge, xgettext, intltool-extract, ...)

Signed-off-by: Jerome Flesch <jflesch@gmail.com>
Merge branch 'testing' into unstable
Merge branch 'unstable' of github.com:jflesch/paperwork into unstable