Warn that deprecated WPLANG constant will be ignored

example.php

<?php
/**
 * display warning in Wordpress admin that WPLANG constant will be ignored
 */
 
is_admin() and add_action( 'admin_notices', function(){
    if( defined('WPLANG') && WPLANG && 3 < (int) $GLOBALS['wp_version'] ){
        echo '<div class="error"><p><strong>Warning</strong> <code>WPLANG</code> is deprecated and should be removed from wp-config.php</p></div>';
    }
} );