Git commits in Moodle 3.8.0 by Didier 'OdyX' Raboud

commit 62e1b79cb049191e498ba1f03024e7983083a4d1
Author: Didier 'OdyX' Raboud <didier.raboud@liip.ch>
Date:   Thu, 14 Mar 2019 21:00:27 +0800
Tag:    v3.8.0-beta

MDL-65067 analytics: Strengthen format_weeks detection