Administration: Replace "Current theme" with "Active theme" in user facing strings.

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

wp-admin/includes/theme.php

@@ -831,7 +831,7 @@ function customize_themes_print_templates() {
 
 				<div class="theme-info">
 					<# if ( data.active ) { #>
-						<span class="current-label"><?php _e( 'Current Theme' ); ?></span>
+						<span class="current-label"><?php _e( 'Active Theme' ); ?></span>
 					<# } #>
 					<h2 class="theme-name">{{{ data.name }}}<span class="theme-version">
 						<?php