Pontoon: Update Polish (pl) localization of MDN
Pontoon: Update Polish (pl) localization of MDN

Localization authors:
- witcher9387 <witcher9387@gmail.com>
- Piotr Drąg <piotrdrag@gmail.com>

jwhitlock/kuma,escattone/kuma,jwhitlock/kuma,a2sheppy/kuma,a2sheppy/kuma,SphinxKnight/kuma,jwhitlock/kuma,mozilla/kuma,SphinxKnight/kuma,escattone/kuma,Elchi3/kuma,SphinxKnight/kuma,mozilla/kuma,a2sheppy/kuma,SphinxKnight/kuma,a2sheppy/kuma,Elchi3/kuma,jwhitlock/kuma,SphinxKnight/kuma,mozilla/kuma,jwhitlock/kuma,a2sheppy/kuma,escattone/kuma,mozilla/kuma,Elchi3/kuma,Elchi3/kuma,SphinxKnight/kuma,mozilla/kuma,Elchi3/kuma