Login link instead of "403 Forbidden" when accessing protected cloud files or folders
when accessing protected cloud files or folders, the visitor (who has guest acces tokens) sees "403 Forbidden". This message is not helpful for the visitor. Instead, a text like "This folder or file is protected. You need to authenticate to be able to see it", together with a login link. After successful login, the initially entered path (to the shared folder or file) should be open in the browser.