changed form property of teacher
Fixes filters in public evaluation page
Merge pull request #434 from diutsu/develop

Closes #433 Fixes filters in public evaluation page
Merge pull request #432 from cbartol/ticket/rt-#408476

Closes #431 Changed form property of struts-teacher
Bug fix: #437
- checking if the event is canceled or not before showing the debt value
Bug fix: Closes #438
- if the Exam has associated date exame document certificate it can not
be deleted; added the correspondent error message
Enhancement: Added the file name error messages to this resource that is
used in teacher portal, to display the correct message.
Adds error message for transposing proposals that dont have the same scheduling
Fixes filters for Teacher Service
Merge pull request #439 from diutsu/develop

Closes #435: Adds error message for transposing proposals that dont have the same scheduling
Closes #440: Fixes filters for Teacher Service