Returns links to the current page with different langcodes.
Using #type causes these links to be rendered with l().
public function lActiveClass() {
  // We assume that 'en' and 'fr' have been configured.
  $languages = language_list();
  return array(
    'no_language' => array(
      '#type' => 'link',
      '#title' => t('Link to the current path with no langcode provided.'),
      '#href' => current_path(),
      '#options' => array(
        'attributes' => array(
          'id' => 'no_lang_link',
        ),
      ),
    ),
    'fr' => array(
      '#type' => 'link',
      '#title' => t('Link to a French version of the current path.'),
      '#href' => current_path(),
      '#options' => array(
        'language' => $languages['fr'],
        'attributes' => array(
          'id' => 'fr_link',
        ),
      ),
    ),
    'en' => array(
      '#type' => 'link',
      '#title' => t('Link to an English version of the current path.'),
      '#href' => current_path(),
      '#options' => array(
        'language' => $languages['en'],
        'attributes' => array(
          'id' => 'en_link',
        ),
      ),
    ),
  );
}