Translation fr - Lesson 4 - update fr/index.json

[antododo]

To complete PR #133

• I did these translations myself and own copyright for them
• I didn't use a machine to do these translations
• I assign all copyright to Loom Network for these translations

[enlight]

Looks good. Thank you!

I do have one question though, why are there spaces in front of punctuation symbols? For example, you wrote Montrez votre armée de zombie à vos amis ! instead of Montrez votre armée de zombie à vos amis!.

[antododo]

It's a typographic rule in French to have a space before those punctuation symbols: ; ? ! : « » Theoretically, it should even be a non-breaking space. In French Canadian, the space is not mandatory and even in France a lot of people forget the space (because of English! 😉 ). It's hard to respect those rules writing both in French and English! For example, we also don't use uppercase for day and month: lundi, janvier.