R1:099695ab6157

Fix unacceptably light-hearted string in serious business mode

Summary: A serious business lost a bunch of serious business partners today because of this string, I assume.

Test Plan: Enabled serious mode, clicked button, was relieved to see no jokes.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6799