Pontoon: Update English (en-GB) localization of Firefox Screenshots
Pontoon: Update English (en-GB) localization of Firefox Screenshots

Localization authors:
- Ian Neal <iann_bugzilla@blueyonder.co.uk>

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