Pontoon: Update French (fr) localization of WebThings Gateway
Pontoon: Update French (fr) localization of WebThings Gateway

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

mozilla-iot/gateway,moziot/gateway,mozilla-iot/gateway,mozilla-iot/gateway,mozilla-iot/gateway,moziot/gateway,mozilla-iot/gateway,moziot/gateway