Locale.php

1. 8.x drupal/core/modules/locale/lib/Drupal/locale/Locale.php
2. 8.x drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Constraints/Locale.php

<?php

/**
 * @file
 * Contains \Drupal\locale\Locale.
 */
namespace Drupal\locale;

use Drupal;

/**
 * Static service container wrapper for locale.
 */
class Locale {

  /**
   * Returns the locale configuration manager service.
   *
   * Use the locale config manager service for creating locale-wrapped typed
   * configuration objects.
   *
   * @see \Drupal\Core\TypedData\TypedDataManager::create()
   *
   * @return \Drupal\locale\LocaleConfigManager
   */
  public static function config() {
    return Drupal::service('locale.config.typed');
  }

}