French localization (adding a new language)

[ShiKaiT0]

Hope the file works as intended ! fr_FR.json (and that I didn't mess up somewhere when following the tutorial)

[AguzzTN54]

I appreciate it. What you have done is correct, but there are still some parts that need adjustments. I hope you can fix them if you are willing. I have marked the sections that still need adjustment with a green box. Please refer to the en-US.json file as an example. You do not need to delete existing properties if you have not translated them.