LanguageServiceProvider::alter

public LanguageServiceProvider::alter(ContainerBuilder $container)

public function alter(ContainerBuilder $container) {
  $definition = $container->getDefinition('language_manager');
  $definition->setClass('Drupal\language\ConfigurableLanguageManager')
    ->addArgument(new Reference('config.factory'))
    ->addArgument(new Reference('module_handler'))
    ->addArgument(new Reference('language.config_factory_override'))
    ->addArgument(new Reference('request_stack'));
  if ($default_language_values = $this->getDefaultLanguageValues()) {
    $container->setParameter('language.default_values', $default_language_values);
  }

  // For monolingual sites, we explicitly set the default language for the
  // language config override service as there is no language negotiation.
  if (!$this->isMultilingual()) {
    $container->getDefinition('language.config_factory_override')
      ->addMethodCall('setLanguageFromDefault', array(new Reference('language.default')));
  }

}