Git commits in Moodle 3.5.x by Thinh Pham

commit 48a9fd89e0a4382a1c747013da18825423df3aeb
Author: Thinh Pham <thinh.phamtien@nashtechglobal.com>
Date:   Wed, 04 Oct 2017 09:54:54 +0800
Tag:    v3.5.0-beta

MDL-60079 User tours: leave unnecessary aria tags in the page