Pontoon: Update Sinhala (si) localization of Firefox Screenshots
Pontoon: Update Sinhala (si) localization of Firefox Screenshots

Localization authors:
- Imesh <cmp.prtctn@gmail.com>
- Kalpa Welivitigoda <callkalpa@gmail.com>

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