Git commits in Moodle 3.4.2 by Huong Nguyen

commit 718235f5696b29cb527a1d611302e07af5530d37
Author: Huong Nguyen <huongnv13@gmail.com>
Date:   Mon, 29 Jan 2018 11:14:26 +0800
Tag:    v3.4.2

MDL-60077 User tours: pop-up triangle look bad next to the corners