We are currently using django.utils.http.is_safe_url which is a private method
and may break API anytime. Replace it with similar but limited implementation.
Tests:
- Unit tests.
- Dismiss a notification and the redirect to the same page happens properly.
- Logout, goto to home page or login page. Change the language and it will
redirect back to home page or login page appropriately.
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>
