Git commits in Moodle 3.10.x by Odei Alba

commit 4c1894aa974757e09d26dfbf8136f7460a2f0516
Author: Odei Alba <odeialba@gmail.com>
Date:   Thu, 19 Aug 2021 23:24:14 +0800
Tag:    v3.10.8

MDL-68325 completion: Add validation to course completion form