Change "Projects" to "Tags" for curtain extension

Summary: This doesn't hit the ambiguous case in Diffusion so it seems fine to make it more consistent.

Test Plan: Looked at a little task-o.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D15561

src/applications/project/engineextension/PhabricatorProjectsCurtainExtension.php

@@ -83,7 +83,7 @@ final class PhabricatorProjectsCurtainExtension
     }
 
     return $this->newPanel()
-      ->setHeaderText(pht('Projects'))
+      ->setHeaderText(pht('Tags'))
       ->setOrder(10000)
       ->appendChild($list);
   }