WordPress Menu Walker, Custom Link with multilingual support

// You put this piece of code in your functions.php file
class CustomLinkModifierWalker extends Walker_Nav_Menu {
   function __( $text ) {
      $text = urldecode( $text );
      if ( preg_match_all('~(.*?)\|(\w{2,})\|~', $text, $matches) ) {
         $text = '';
         foreach ($matches[1] as $i => $match) {
            $text .= "[:{$matches[2][$i]}]$match";
         }
         $text = __( $text );
      }
      return $text;
   }
   function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
      global $wp_query;
      $indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

      $class_names = $value = '';

      $classes = empty( $item->classes ) ? array() : (array) $item->classes;
      $classes[] = 'menu-item-' . $item->ID;

      $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
      $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';

      $id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
      $id = $id ? ' id="' . esc_attr( $id ) . '"' : '';

      $output .= $indent . '<li' . $id . $value . $class_names .'>';

      $attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
      $attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
      $attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
      $attributes .= ! empty( $item->url )    ? ' href="' . esc_attr( $this->__( $item->url )  ) .'"' : '';

      $item_output = $args->before;
      $item_output .= '<a'. $attributes .'>';
      $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
      $item_output .= '</a>';
      $item_output .= $args->after;

      $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
   }
}