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

props ericlewis, kraftbj, lukecarbis, mrmist.
fixes #33680. see #14530.
Built from https://develop.svn.wordpress.org/trunk@33886


git-svn-id: http://core.svn.wordpress.org/trunk@33855 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/widgets.php

@@ -12,8 +12,13 @@ require_once( dirname( __FILE__ ) . '/admin.php' );
 /** WordPress Administration Widgets API */
 require_once(ABSPATH . 'wp-admin/includes/widgets.php');
 
-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
+	);
+}
 
 $widgets_access = get_user_setting( 'widgets_access' );
 if ( isset($_GET['widgets-access']) ) {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-33885';
+$wp_version = '4.4-alpha-33886';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.