$output[$field_name] = array(
    '#theme' => 'field',
    '#title' => $instance['label'],
    '#label_display' => 'hidden',
    '#field_type' => $field['type'],
    '#field_name' => $field_name,
    '#bundle' => $node->type,
    '#object' => $node,
    '#items' => array(1),
    '#entity_type' => 'node',
    '#weight' => $display['weight'],
    0 => array('#markup' => t($line)),
  );

white-space
#  translator-comments
#. extracted-comments
#: reference...
#, flag...
#| msgid previous-untranslated-string
msgid untranslated_string
msgstr translated_string