Git commits in Moodle 3.2.x by Mathieu Petit-Clair

commit 90e86c75681b4be4c37e72b7e606ae626be875e6
Author: Mathieu Petit-Clair <mathieu@petitclair.ca>
Date:   Tue, 16 May 2017 15:00:51 +0800
Tag:    v3.2.4

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