add_filter( \'get_terms_args\', \'wpse_53094_sort_get_terms_args\', 10, 2 );
function wpse_53094_sort_get_terms_args( $args, $taxonomies ) 
{
    global $pagenow;
    if( !is_admin() || (\'post.php\' != $pagenow && \'post-new.php\' != $pagenow) ) 
            return $args;

    $args[\'orderby\'] = \'slug\';
    $args[\'order\'] = \'DESC\';

    return $args;
}