Improve error message when trying to access an archived project
If you try to access an issue that is inside a project that has been archived Redmine throws a 403 error. This is confusing: perhaps Redmine should tell the user that the project in question has been archived instead? E.g.
"This project has been archived. To access this issue you will need to unarchive the issue at /admin/projects".
(The code in question is at line 233 inside user.rb (inside def allowed_to?) where Redmine checks to see if the parent project of the requested issue is active and returns a 403 if not)