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Raise human-readable error messages for overlong Phame blog titles and subtitles

Description

Raise human-readable error messages for overlong Phame blog titles and subtitles

Summary:
Fixes T11358. Entering a too-long title/subtitle currently raises an unfriendly (database-level) error.

Raise a friendlier error.

Test Plan:

Screen Shot 2016-07-21 at 7.13.06 AM.png (1×1 px, 192 KB)

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11358

Differential Revision: https://secure.phabricator.com/D16313