Pontoon: Update Breton (br) localization of Firefox Screenshots
Pontoon: Update Breton (br) localization of Firefox Screenshots

Localization authors:
- Gwenn <tornoz@laposte.net>

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