Git commits in Moodle 3.4.x by David Herney

commit 571ee73a7715c847dbeca313de7a23cd496bf6f9
Author: David Herney <davidherney@gmail.com>
Date:   Fri, 28 Sep 2018 07:44:00 +0800
Tag:    v3.4.6

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

commit 5a6a4cef8b022d0807f34cfc806dbc029e98ad7d
Author: David Herney <davidherney@gmail.com>
Date:   Tue, 28 Nov 2017 09:18:12 +0800
Tag:    v3.4.1

MDL-60443 dataformat lib: Change a wrong variable name