Create fr translation + Translate index.html
Translate fr installation/deploy.md,index.md,linux.md + Replace all example_translation to fr
Update config to add french
FR: correct few mistakes (thanks to @soyuka)
FR: now up-to-date with 8e44fa9
Merge pull request #1496 from marvinroger/gh-pages

[Translations: /fr] Started French translation