Pontoon: Update Slovak (sk) localization of Firefox Screenshots
Pontoon: Update Slovak (sk) localization of Firefox Screenshots

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

mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/pageshot