Pontoon: Update Slovak (sk) localization of Mozilla Learning Network
Pontoon: Update Slovak (sk) localization of Mozilla Learning Network

Localization authors:
- Juraj Cigáň <kusavica@gmail.com>
- Pavol Ilko <palciny@gmail.com>

mozilla/teach.webmaker.org,mozilla/learning.mozilla.org,mozilla/teach.mozilla.org,mozilla/teach.webmaker.org,mozilla/teach.mozilla.org