Pontoon: Update Slovak (sk) localization of Test Pilot Website
Pontoon: Update Slovak (sk) localization of Test Pilot Website

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

chuckharmston/testpilot,mozilla/idea-town,lmorchard/idea-town,lmorchard/idea-town-server,mozilla/idea-town-server,lmorchard/idea-town,mozilla/idea-town,chuckharmston/testpilot,meandavejustice/testpilot,meandavejustice/testpilot,lmorchard/testpilot,lmorchard/idea-town-server,meandavejustice/testpilot,chuckharmston/testpilot,mozilla/idea-town-server,flodolo/testpilot,chuckharmston/testpilot,flodolo/testpilot,fzzzy/testpilot,lmorchard/testpilot,lmorchard/testpilot,mozilla/idea-town-server,lmorchard/testpilot,mozilla/idea-town,lmorchard/idea-town-server,fzzzy/testpilot,flodolo/testpilot,lmorchard/idea-town,flodolo/testpilot,fzzzy/testpilot,lmorchard/idea-town,mozilla/idea-town-server,fzzzy/testpilot,mozilla/idea-town,lmorchard/idea-town-server,meandavejustice/testpilot