Git commits in Moodle 3.1.5 by Helen Foster

commit bdff8c070fe96bc46bfe2cfea083005d056a0996
Author: Helen Foster <helen@moodle.org>
Date:   Mon, 27 Feb 2017 17:27:58 +0800
Tag:    v3.1.5

MDL-58064 lang: Merge English strings from the en_fix language pack