[Tails-l10n] [fr](review) contribute

Hello, I change one sentence and I copy the English content wich don't
need a translation.

Please review.

Repo: https://git-tails.immerda.ch/xin/tails/
Branch: translate/contribute
Last Commit: 36aac2a1e95e45faacbffad7e9be80278eeec002

Cheers.
xin