Git commits in Moodle 3.9.4 by Ferran Recio

commit 8bbc064e29288917965035b0a3f6423599dc6cc0
Author: Ferran Recio <ferran@moodle.com>
Date:   Fri, 20 Nov 2020 23:20:46 +0800
Tag:    v3.9.4

MDL-67782 message: fix messages max length