Git commits in Moodle 3.5.18 by Sara Arjona

commit efd261ab7dae709d68019cfce474c7fb41a3bc78
Author: Sara Arjona <sara@moodle.com>
Date:   Fri, 12 Mar 2021 00:18:54 +0800
Tag:    v3.5.18

weekly release 3.5.17+