tmgmt-8.x-1.x-dev/translators/tmgmt_local/skills/tmgmt_language_combination.module

<?php

/**
 * @file
 * Main module file for the tmgmt language combination module.
 */

use Drupal\Core\Language\LanguageManager;

/**
 * Prepares a language code list for a select form item with all languages.
 */
function tmgmt_language_combination_languages_predefined_list() {
  $predefined = &drupal_static(__FUNCTION__);

  if (!isset($predefined)) {
    $predefined = LanguageManager::getStandardLanguageList();

    foreach ($predefined as $key => $value) {

      // Include native name in output, if possible.
      if (count($value) > 1) {
        $predefined[$key] = ($value[0] == $value[1]) ? $value[0] : "$value[0] ($value[1])";
      }
      else {
        $predefined[$key] = $value[0];
      }
    }

    // Add custom languages that are not part of the iso.inc definition.
    $installed_languages = \Drupal::languageManager()->getLanguages();
    foreach ($installed_languages as $lang => $info) {
      if (!isset($predefined[$lang])) {
        $predefined[$lang] = $info->getName();
      }
    }

    asort($predefined);
  }

  return $predefined;
}