How to display translated fields labels of a node view

Question

I would like to display a node in NL. This node is not translatable but I would like to have the fields labels translated in NL.

This rendering occurs in a cron job and is used to render an email in the recipient language (ex: NL).

Unfortunately, the following code output the labels in the current language of the page (if I run it outside the cron) or in the default language of the site from within the cron job

$entity = Drupal\node\Entity\Node::load($nid);
$view_builder = Drupal::entityTypeManager()->getViewBuilder($entity->getEntityTypeId());
$summary = $view_builder->view($entity, 'summary', 'nl');
$render=Drupal::service('renderer')
->renderPlain($summary);
dpm($render);

Solutions I have already tested:

1-I have tried the solution which set the config override language to the desired language here without luck

2-I have also tried the solution which set a custom language negotiator here without success

3-Finally I have tried the solution which use the 'language' session parameter here without any result

I have traced the code and I think that the language is selected/choose in the render part... But it was really difficult to understand this due to the complexity.

I was also thinking to add a '#langcode' to the build but I couldn't find an example.

Answer 1

To display translated field labels you need to add solution 1 to the code you have already and also clear the cached field definitions, which unfortunately don't cache per config language.

The complete code should look like this:

$language_manager = \Drupal::languageManager();

$nid = 1;
$langcode = 'nl';
$language = $language_manager->getLanguage($langcode);

$original_language = $language_manager->getConfigOverrideLanguage();
$language_manager->setConfigOverrideLanguage($language);
\Drupal::service('entity_field.manager')->clearCachedFieldDefinitions();
drupal_static_reset('options_allowed_values');

$entity = Node::load($nid);
$view_builder = \Drupal::entityTypeManager()->getViewBuilder($entity->getEntityTypeId());
$summary = $view_builder->view($entity, 'summary', $langcode);
$render = \Drupal::service('renderer')
  ->renderPlain($summary);

$language_manager->setConfigOverrideLanguage($original_language);
\Drupal::service('entity_field.manager')->clearCachedFieldDefinitions();