This change replaces "Current theme" with "Active theme" in user-facing strings. It brings better consistency across the Administration. Props Presskopp, audrasjb, costdev. Fixes #54770. Built from https://develop.svn.wordpress.org/trunk@52580 git-svn-id: http://core.svn.wordpress.org/trunk@52170 1a063a9b-81f0-0310-95a4-ce76da25c4cd