Port 1577458 - Add fluent branding files to Whats New Panel r=Mardak
Port 1577458 - Add fluent branding files to Whats New Panel r=Mardak

Differential Revision: https://phabricator.services.mozilla.com/D43964

Signed-off-by: Ed Lee <538d125fdeb565dcd3206241dcc3af47abb27687@mozilla.com>

mozilla/activity-streams,mozilla/activity-stream,mozilla/activity-stream,mozilla/activity-stream,mozilla/activity-stream,mozilla/activity-streams