Summary: Ref T9551. We currently use the same logic for generating project hashtags and Phriction slugs, but should be a little more conservative with project hashtags. Stop them from generating with stuff that won't parse in a "Reviewers:" field or generally in commments (commas, colons, etc). Test Plan: Created a bunch of projects with nonsense in them and saw them generate pretty reasonable hashtags. {F873456} Reviewers: chad Reviewed By: chad Maniphest Tasks: T9551 Differential Revision: https://secure.phabricator.com/D14261