Git commits in Moodle 3.3.4 by David Herney

commit 5cb58b2db47317de5eb342e14c3cdf9ef1910e57
Author: David Herney <davidherney@gmail.com>
Date:   Tue, 28 Nov 2017 09:19:30 +0800
Tag:    v3.3.4

MDL-60443 dataformat lib: Change a wrong variable name