Pontoon: Update French (fr) localization of Thimble
Pontoon: Update French (fr) localization of Thimble

Localization authors:
- Théo Chevalier <theo.chevalier11@gmail.com>

mozilla/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,humphd/thimble.mozilla.org