[Tails-l10n] [fr](review) wiki/src/news/version...

Hello, I update three news.
version_2.4, I translate one paragraph.
version_2.0, I use a old unmerged branch by Chre.
version_1.2, I update only one sentence, you don't have to review all
the file.

Repo : https://git-tails.immerda.ch/xin/tails/
Branch : translate/news2
Last Commit : 3beaa7a25e363200834995737df5b24f6053d2e3

Cheers.
xin