/**
 * Implements hook_language_negotiation_info_alter().
 */
function {{ machine_name }}_language_negotiation_info_alter(array &$negotiation_info) {
  if (isset($negotiation_info['custom_language_method'])) {
    $negotiation_info['custom_language_method']['config'] = 'admin/config/regional/language/detection/custom-language-method';
  }
}