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Improve error messages for bad hashtags and project names

Description

Improve error messages for bad hashtags and project names

Summary: Ref T8509. We currently give you a fairly obtuse error when trying to name a project something like "!!". The error is correct, but not as helpful as it could be. Give users a more specific, more helpful error.

Test Plan:

Screen Shot 2015-12-24 at 4.42.46 AM.png (1×1 px, 188 KB)

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T8509

Differential Revision: https://secure.phabricator.com/D14872