Pontoon: Update Polish (pl) localization of AMO Frontend
Pontoon: Update Polish (pl) localization of AMO Frontend

Localization authors:
- Piotr Drąg <piotrdrag@gmail.com>

mozilla/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,kumar303/addons-frontend