Developer credits
Git merges in Moodle 3.1.18 by Eloy Lafuente (stronk7)
commit 5561a23dad72c853fb669f3963bf7d2a5cfd960a Author: Eloy Lafuente (stronk7) <stronk7@moodle.org> Date: Sat, 11 May 2019 02:30:57 +0800 Tag: v3.1.18 Merge branch 'install_31_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_31_STABLE