In addressing the test_mod_forum_get_forum_discussion_posts_deleted() method in MDL-65252, I noted that the 'privacy:request:delete:post:message' string can probably now be deprecated, since it's no longer used. The string 'privacy:request:delete:post:subject' appears to be in use still, in mod/forum/rsslib.php, however. Not sure why this was being used in the regular deletion stuff, but a quick grep revealed it wasn't in use once that test method was updated.