Update fr translations

[RAM-4]

First of all, many thanks to @lyonelf for the first version of french translations. Here are the changes introduced by this PR:

• missing translations added
• existing ones improved (imo) based on : context, french syntax and grammar

[lyonelf]

Hello,

yes it needed a massive update.

all changes are ok, maybe except master key, i think it's better to let in male and not female.

for the rest you can commit online