Fixed inconsistency at phriction

Summary:

• All Applications are useing the description "Tags", Phriction actually uses "Projects"
• Changed "Projects" to "Tags" for phriction

Ref T11614

Test Plan:

• Edited a document, took a look at the description for that input line
• Added a project to a page and saved it

Reviewers: chad, Blessed Reviewers

Reviewed By: chad, Blessed Reviewers

Subscribers: avivey, chad, epriestley

Tags: Phriction

Maniphest Tasks: T11614

Differential Revision: https://secure.phabricator.com/D16537