Git commits in Moodle 3.6.4 by Helen Foster

commit 34d9787deced051d20df52d40e19298171639582
Author: Helen Foster <helen@moodle.org>
Date:   Fri, 10 May 2019 16:31:53 +0800
Tag:    v3.6.4

MDL-65537 lang: Import fixed English strings (en_fix)

commit 506317da3a9057d01885530c84575c917a9a2b4a
Author: Helen Foster <helen@moodle.org>
Date:   Mon, 29 Apr 2019 17:45:16 +0800
Tag:    v3.6.4

MDL-65397 lang: Import fixed English strings (en_fix)