Git commits in Moodle 3.9.6 by Ilya Tregubov

commit f702707ef78d402f41bf1cd34ad0f4d43b12bea7
Author: Ilya Tregubov <ilya@moodle.com>
Date:   Wed, 03 Mar 2021 17:11:23 +0800
Tag:    v3.9.6

MDL-71026 user: Fix incorrect get_string call.