Summary: Builds a complete font package for browsers that support woff2. Ref T7066
Test Plan: Visit a test page locally with addtional languages.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T7066
Differential Revision: https://secure.phabricator.com/D11545
