Steps to Reproduce:
1. Go to workflow
2. Change Calendar Event to Single Approver
3. Go to page, add Calendar portlet on page
4. Add Event and submit
5. Go to My Workflow Tasks -> Assigned to My Roles
6. Click three option and Assign to me
7. Go to 'Assign to me' tab, approve it
8. Go back to calendar
9. Click the one you added in the previous step
10. Click Edit button
The button does not display properly.
Button is broken.