Git commits in Moodle 3.5.2 by Huong Nguyen

commit 6c1aa273f258ccb097f7b2904181c347129fdba4
Author: Huong Nguyen <huongnv13@gmail.com>
Date:   Wed, 27 Jun 2018 15:32:48 +0800
Tag:    v3.5.2

MDL-62814 Question: Improve column base display_header


commit 7a81bcdb341b9e7c7384e31d44a7e25d4cce92c3
Author: Huong Nguyen <huongnv13@gmail.com>
Date:   Thu, 14 Jun 2018 14:54:39 +0800
Tag:    v3.5.2

MDL-62712 Filepicker: Improve upload process