Git commits in Moodle 3.3.x by Mathieu Petit-Clair

commit f05e2e66908f59a8e40169d48a9f552dc0c90aa1
Author: Mathieu Petit-Clair <mathieu@petitclair.ca>
Date:   Tue, 16 May 2017 15:00:51 +0800
Tag:    v3.3.1

MDL-58952 admin: use valid default for language selection dropdown.