Drupal 7, overwrite menu block tree

mymodule.module

<?php

/**
 * Implements hook_menu_block_tree_alter().
 */
function mymodule_menu_block_tree_alter(&$tree, &$config) {
  global $language;
  $default = language_default('language');

  if($language->language != $default) {
    $item = menu_link_load($config['parent_mlid']);
    if($item['language'] != $language->language) {
      // We want to show the correct language for our menu tree, what we will do next is not as pretty as we want
      // it to be, but it will work. Get the translation of $item in $language->language and replace the current
      // tree target with the children of the translation.
      $result = db_select('menu_links', 'ml')
        ->fields('ml', array('mlid'))
        ->condition('i18n_tsid', $item['i18n_tsid'])
        ->condition('language', $language->language)
        ->execute()
        ->fetchAssoc();
      if($result) {
        $config['parent_mlid'] = $result['mlid'];
      }
    }
  }
}