Pontoon: Update Polish (pl) localization of WebThings Gateway
Pontoon: Update Polish (pl) localization of WebThings Gateway

Localization authors:
- Michał <michaljanpatyk@gmail.com>

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