Provide more helpful feedback than just "Cheatin' uh?" for permission errors in `wp-admin/customize.php`.

props ericlewis, kraftbj, lukecarbis, mrmist.
fixes #33668. see #14530.
Built from https://develop.svn.wordpress.org/trunk@33857


git-svn-id: http://core.svn.wordpress.org/trunk@33825 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/customize.php

@@ -13,7 +13,11 @@ define( 'IFRAME_REQUEST', true );
 require_once( dirname( __FILE__ ) . '/admin.php' );
 
 if ( ! current_user_can( 'customize' ) ) {
-	wp_die( __( 'Cheatin’ uh?' ), 403 );
+	wp_die(
+		'<h1>' . __( 'Cheatin&#8217; uh?' ) . '</h1>' .
+		'<p>' . __( 'You are not allowed to customize the appearance of this site.' ) . '</p>',
+		403
+	);
 }
 
 wp_reset_vars( array( 'url', 'return' ) );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-33856';
+$wp_version = '4.4-alpha-33857';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.