Translations string email not work

Question

in D8 (multilanguage site, with two languages) i wanna send email for registration, etc by user preference of language of user (People -> Edit people -> Language Settings)

I've enabled all modules for translations and translations are saved correctly (see the attachment).

I followed this guide: https://www.valuebound.com/resources/blog/how-to-send-mail-programmatically-drupal-8 but not work for me.

The language code passed for the email is correct but the email is always send in default language (in my case, english).

Answer 1

Be sure that the string you sent by mail is already translated in the target language. Otherwise it will not work. You can check it here http://youwebsite.com/admin/config/regional/translate

Answer 2

For solve this problem, in hook_mail insert this:

    $token = \Drupal::service('token');
    $language_manager = \Drupal::languageManager();
    $language = $language_manager->getLanguage($user->getPreferredLangcode());
    $original_language = $language_manager->getConfigOverrideLanguage();
    $language_manager->setConfigOverrideLanguage($language);
    $mail_config = \Drupal::config('user.mail');

    $subject = $token->replace($mail_config->get($key . '.subject'), [
        'user' => $user
    ]);

    $body = $token->replace($mail_config->get($key . '.body'), [
        'user' => $user
    ]);

    $language_manager->setConfigOverrideLanguage($original_language);