/**
 * Implements hook_contextual_links_alter().
 */
function {{ machine_name }}_contextual_links_alter(array &$links, $group, array $route_parameters) {
  if ($group == 'menu') {
    // Dynamically use the menu name for the title of the menu_edit contextual
    // link.
    $menu = \Drupal::entityManager()->getStorage('menu')->load($route_parameters['menu']);
    $links['menu_edit']['title'] = t('Edit menu: @label', ['@label' => $menu->label()]);
  }
}