Redirect to Login page if response submission is attempted without authenticating

[JayjeetAtGithub]

Currently , if a response submission is attempted by an unauthenticated user , the page just refreshes. This is not a good user experience. This should be improved by redirecting to the login page using @login_required decorator.

[arc9693]

Currently,there is a login link if the user is unauthenticated. Automatic redirection should happen before landing on to the submission page.
Reference:
Submission page