Git commits in Moodle 3.3.8 by David Monllao

commit ab883ad6b09399071acce5cd73d1626ef9f4dae1
Author: David Monllao <davidm@moodle.com>
Date:   Mon, 27 Aug 2018 18:11:53 +0800
Tag:    v3.3.8

MDL-63187 tool_dataprivacy: Update delete purpose and category lang strings