Currently, when users with admin rights close the review request, 

the email template shows the wrong name in the signature at the 

bottom of the e-mail content.
This change involves replacing the review_request.submitter 

with user to display the name of the admin / user that 

closed the review request instead of the owner of the 

review request.

Added unit test to test_sending_email.py 
I have also included the screenshots that show the changes: 


This screenshot shows the TXT e-mail that is created when 

I re-opened the review request and published it. My name is 

in the signature of the e-email.


This screenshot shows the TXT e-mail that is created when 

a user with admin rights closed the review request (discarded). 

The name of the user with admin rights (superUser Admin) is 

in the signature of the e-mail.