Git commits in Moodle 3.9.0 by Daniel Thies

commit bf270d13fa0abd366ee5683bbe028b045e9c3c5e
Author: Daniel Thies <dethies@gmail.com>
Date:   Sat, 15 Feb 2020 01:42:33 +0800
Tag:    v3.9.0-beta

MDL-67817 core_lang: Update timezone strings deprecating old identifiers

commit a632739617a25545f87eae00b2b44191f3c2792e
Author: Daniel Thies <dethies@gmail.com>
Date:   Fri, 07 Feb 2020 23:51:19 +0800
Tag:    v3.9.0-beta

MDL-67817 core_date: Add test for timezone localization strings

commit 158898254cd2bf20c8126c22960a33d460e4def5
Author: Daniel Thies <dethies@gmail.com>
Date:   Sun, 20 Oct 2019 12:59:14 +0800
Tag:    v3.9.0-beta

MDL-66671 enrol_lti: Skip grade sync when cm deleted