Automatically translate double field select value, but not free text
Here is a simple workaround:

/**
 * Implements hook_field_widget_form_alter().
 */
function HOOK_field_widget_form_alter(&amp;$element, &amp;$form_state, $context) {
  if ($context['instance']['widget']['type'] == 'select_&amp;_textfield') {
    foreach ($element['first']['#options'] as $key =&gt; $label) {
      $element['first']['#options'][$key] = t($label);
    }
  }
}