Git commits in Moodle 3.7.3 by Tobias Reischmann

commit 39a390f1f5155bc4feda5019afd9dd56ce1eb471
Author: Tobias Reischmann <tobias.reischmann@wi.uni-muenster.de>
Date:   Wed, 28 Aug 2019 21:12:40 +0800
Tag:    v3.7.3

MDL-66543 forms: Make (hard) frozen textareas readonly (or disabled)