Fixes for the project page

Summary:
Wrong header, should say Project instead of People and two buttons had "Project
Project"

Test Plan:
UI fixes, no real test plan needed

Reviewers: tuomaspelkonen, aran
Commenters: tuomaspelkonen, aran
CC: aran, tuomaspelkonen, hsb, epriestley
Revert Plan:
No plan needed, just revert this UI fix revision

Differential Revision: 338