Language.php

1. 8.x drupal/core/lib/Drupal/Core/Language/Language.php
2. 8.x drupal/core/lib/Drupal/Core/TypedData/Type/Language.php
3. 8.x drupal/core/modules/language/lib/Drupal/language/Plugin/Condition/Language.php
4. 8.x drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Constraints/Language.php
5. 8.x drupal/core/modules/node/lib/Drupal/node/Plugin/views/field/Language.php
6. 8.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/field/Language.php
7. 8.x drupal/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/Language.php

<?php

/**
 * @file
 * Definition of Drupal\user\Plugin\views\field\Language.
 */
namespace Drupal\user\Plugin\views\field;

use Drupal\Component\Annotation\PluginID;

/**
 * Views field handler for user language.
 *
 * @ingroup views_field_handlers
 *
 * @PluginID("user_language")
 */
class Language extends User {
  function render_link($data, $values) {
    $uid = $this
      ->getValue($values, 'uid');
    if (!empty($this->options['link_to_user'])) {
      $uid = $this
        ->getValue($values, 'uid');
      if (user_access('access user profiles') && $uid) {
        $this->options['alter']['make_link'] = TRUE;
        $this->options['alter']['path'] = 'user/' . $uid;
      }
    }
    if (empty($data)) {
      $lang = language_default();
    }
    else {
      $lang = language_list();
      $lang = $lang[$data];
    }
    return $this
      ->sanitizeValue($lang->name);
  }
  function render($values) {
    $value = $this
      ->getValue($values);
    return $this
      ->render_link($this
      ->sanitizeValue($value), $values);
  }

}