qmlui: review current French translations
qmlui: review current French translations

It mainly corrects some mistakes, makes consistent used words and
expressions regarding French rules, and translates 'Manager'. No
new translations are added.

sbenejam/qlcplus,sbenejam/qlcplus,kripton/qlcplus,kripton/qlcplus,sbenejam/qlcplus,sbenejam/qlcplus,sbenejam/qlcplus,mcallegari/qlcplus,kripton/qlcplus,kripton/qlcplus,plugz/qlcplus,plugz/qlcplus,sbenejam/qlcplus,kripton/qlcplus,sbenejam/qlcplus,mcallegari/qlcplus,mcallegari/qlcplus,plugz/qlcplus,plugz/qlcplus,plugz/qlcplus,mcallegari/qlcplus,plugz/qlcplus,mcallegari/qlcplus,kripton/qlcplus,kripton/qlcplus,plugz/qlcplus,mcallegari/qlcplus,mcallegari/qlcplus