Git commits in Moodle 3.5.x by David Herney

commit 9b40d154ffff237119b6203c21abb0e354547772
Author: David Herney <davidherney@gmail.com>
Date:   Fri, 28 Sep 2018 07:42:50 +0800
Tag:    v3.5.3

MDL-63323 course: Fixed wrong classes key in activity_navigation class

commit d52e5dd32df7f0caecb51812617a8bb4f1e3e666
Author: David Herney <davidherney@gmail.com>
Date:   Tue, 28 Nov 2017 09:15:30 +0800
Tag:    v3.5.0-beta

MDL-60443 dataformat lib: Change a wrong variable name