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

props ericlewis, kraftbj, lukecarbis, mrmist.
fixes #33673. see #14530.
Built from https://develop.svn.wordpress.org/trunk@33862


git-svn-id: http://core.svn.wordpress.org/trunk@33830 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/nav-menus.php

@@ -19,8 +19,13 @@ if ( ! current_theme_supports( 'menus' ) && ! current_theme_supports( 'widgets'
 	wp_die( __( 'Your theme does not support navigation menus or widgets.' ) );
 
 // Permissions Check
-if ( ! current_user_can('edit_theme_options') )
-	wp_die( __( 'Cheatin’ uh?' ), 403 );
+if ( ! current_user_can( 'edit_theme_options' ) ) {
+	wp_die(
+		'<h1>' . __( 'Cheatin&#8217; uh?' ) . '</h1>' .
+		'<p>' . __( 'You are not allowed to edit theme options on this site.' ) . '</p>',
+		403
+	);
+}
 
 wp_enqueue_script( 'nav-menu' );
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-33861';
+$wp_version = '4.4-alpha-33862';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.