How to I get the translated content of field when adding by field_attach_form()?

H,

I want to create a custom form where I want to add some fields of a node. The fields are translateable and I call my custom form in the language the node fields should be filled in. I tried the following:

$form = array();

  $fields = array(
    'field_name1',
    'field_name2',
    'field_name3',
    'field_name4'
  );

  foreach ($fields as $fieldname) {
    field_attach_form('node', $node, $form, $form_state, NULL, array('field_name' => $fieldname));
  }

  global $language;
  $langcode = $language->language;
  $handler = entity_translation_get_handler('node', $node);
  $handler->setActiveLanguage($langcode);


  $form['actions'] = array(
    '#type' => 'actions'
  );

  $form['actions']['submit'] = array(
    '#type' => 'submit',
    '#value' => 'Absenden'
  );

return $form;

This translates the field labels but not the values in the field. It shows in the title that the correct language is chosen (title shows "[Français]" and the correct french node title )but the fields have the value of the original language. When I add the $handler stuff before calling field_attach_form() the fields are not editable in French when the original language is English.

Can someone help me how I get the translated fields in this way?

Best and many thanks in advance,
Tobias