Git commits in Moodle 3.4.2 by KietLy

commit 93482c3a53af7361c1c46abe4f4936ccea899061
Author: KietLy <Kiet.LyChan@nashtechglobal.com>
Date:   Thu, 28 Dec 2017 14:23:47 +0800
Tag:    v3.4.2

MDL-60078 User tours accessibility: Tab should go back into the pop-up