i18n: Fix typo in studio's email

The right parenthesis should be appeared before the method '.format', not after.

cms/templates/emails/course_creator_admin_subject.txt

 <%! from django.utils.translation import ugettext as _ %>
-${_("{email} has requested Studio course creator privileges on edge".format(email=user_email))}
\ No newline at end of file
+${_("{email} has requested Studio course creator privileges on edge").format(email=user_email)}
\ No newline at end of file

cms/templates/emails/course_creator_admin_user_pending.txt

 <%! from django.utils.translation import ugettext as _ %>
-${_("User '{user}' with e-mail {email} has requested Studio course creator privileges on edge.".format(user=user_name, email=user_email))}
+${_("User '{user}' with e-mail {email} has requested Studio course creator privileges on edge.").format(user=user_name, email=user_email)}
 ${_("To grant or deny this request, use the course creator admin table.")}
 
 % if is_secure: