Predefined language setup form.
function locale_languages_predefined_form($form) {
$predefined = _locale_prepare_predefined_list();
$form['language list'] = array(
'#type' => 'fieldset',
'#title' => t('Predefined language'),
'#collapsible' => TRUE,
);
$form['language list']['langcode'] = array(
'#type' => 'select',
'#title' => t('Language name'),
'#default_value' => key($predefined),
'#options' => $predefined,
'#description' => t('Use the <em>Custom language</em> section below if your desired language does not appear in this list.'),
);
$form['language list']['actions'] = array(
'#type' => 'actions',
);
$form['language list']['actions']['submit'] = array(
'#type' => 'submit',
'#value' => t('Add language'),
);
return $form;
}