Git commits in Moodle 3.5.7 by Sara Arjona

commit 263b3cb643240f777accf17707424ce0bc6d388a
Author: Sara Arjona <sara@moodle.com>
Date:   Tue, 14 May 2019 19:17:33 +0800
Tag:    v3.5.7

weekly release 3.5.6+