Fix: fr-FR translations

[Marc-Andrieu]

I came to disambiguate one thing (hence the branch name), then realized a couple other fixes were to be done, namely:

• "email" > "e-mail"
• "connection" (misspelling) > "connexion"
• Whitespace before "?"
• Homogenize some sets of analogous translations
• Replaced some words to feel more natural in French, less verbatim from English
• A few other minor fixes

[CLAassistant]

All committers have signed the CLA.

[meltyshev]

Thanks for the update!