Preventing students from making changes after a predefined deadline

Preventing students from making changes after a predefined deadline. Deadline for this academic year: 17 Oct 2022.

app/messages/__init__.py

 from .message_builders import (
+    deadline_expired_for_students,
     login_manager_message,
     login_unsuccessful_error,
     project_not_found,
@@ -14,3 +15,5 @@ LOGIN_MANAGER_MESSAGE = login_manager_message()
 
 PROJECT_NOT_FOUND = project_not_found()
 SHORTLIST_NOT_FOUND = shortlist_not_found()
+
+DEADLINE_EXPIRED_FOR_STUDENTS = deadline_expired_for_students()