Summary: Ref T7152. Ref T1139. This updates Phabricator so third-party libraries can translate their own stuff. Also: - Hide "All Caps" when not in development mode, since some users have found this a little confusing. - With other changes, adds a "Raw Strings" mode (development mode only). - Add an example silly translation to make sure the serious business flag works. - Add a basic British English translation. - Simplify handling of translation overrides. Test Plan: - Flipped serious business / development on and off and saw silly/development translations drop off. - Switched to "All Caps" and saw all caps. - Switched to Very English, Wow! - Switched to British english and saw "colour". Reviewers: btrahan Reviewed By: btrahan Subscribers: epriestley Maniphest Tasks: T7152, T1139 Differential Revision: https://secure.phabricator.com/D11747