Git commits in Moodle 3.8.4 by Thomas.Ludwig

commit 852cda447fd594294b3cf877ff33cdd83f470ef9
Author: Thomas.Ludwig <thomas.ludwig@isb.bayern.de>
Date:   Tue, 10 Mar 2020 22:01:29 +0800
Tag:    v3.8.4

MDL-67903 core_grades: remove outdated CSS for grade import form