Git commits in Moodle 3.5.6 by Thomas Korner

commit f059d1176c3fc94f322f74fb970b00b7838ae273
Author: Thomas Korner <thomas.korner@let.ethz.ch>
Date:   Fri, 05 Apr 2019 19:59:39 +0800
Tag:    v3.5.6

MDL-65279 core: typo in categoriesandcourses fixed