Git commits in Moodle 3.6.x by Felice Candilio

commit 2c7a5674918dc06f557b07c3f3f64301e66073f3
Author: Felice Candilio <felicemcc@gmail.com>
Date:   Thu, 31 Jan 2019 18:07:01 +0800
Tag:    v3.6.3

 MDL-64649 amd: Removing underscores from icons in [Roles/Groups] forms