make form editing more obvious

Summary: Change the breadcrumb title display into normal text, and add a specific Edit Form link to the header

Test Plan: try creating and editing a form using the new link

Reviewers: rjmackay, vladimir, shadowhand

Reviewed By: shadowhand

Subscribers: srutto

Maniphest Tasks: T920

Differential Revision: https://phabricator.ushahidi.com/D442