Pontoon: Update Dutch (nl) localization of WebThings Gateway
Pontoon: Update Dutch (nl) localization of WebThings Gateway

Localization authors:
- Mark Heijl <markh@babelzilla.org>

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