Pontoon: Update Japanese (ja) localization of WebThings Gateway
Pontoon: Update Japanese (ja) localization of WebThings Gateway

Localization authors:
- marsf <chimantaea_mirabilis@yahoo.co.jp>

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