Git commits in Moodle 3.3.5 by Sara Arjona

commit a5bac6732628a503f859dc2111986f5b3a0356fd
Author: Sara Arjona <sara@moodle.com>
Date:   Thu, 22 Feb 2018 03:53:19 +0800
Tag:    v3.3.5

MDL-55153 customlang: Remove local DB entries when deleting local file

commit 5613a37ab2a3a98c3a02f5920e51c173b9d759c0
Author: Sara Arjona <sara@moodle.com>
Date:   Mon, 12 Feb 2018 15:55:38 +0800
Tag:    v3.3.5

MDL-61421 cohort: Fix cohort_role_sync when a user is in two cohorts

commit 0c8d6093dcf17b5b6e8eba8b77ea3385bab37d51
Author: Sara Arjona <sara@moodle.com>
Date:   Wed, 24 Jan 2018 18:56:32 +0800
Tag:    v3.3.5

MDL-61261 badges: Add email validation during backpack configuration