Implements hook_form_FORM_ID_alter() for language_admin_add_form(().
function locale_form_language_admin_add_form_alter(&$form, &$form_state) {
$form['predefined_submit']['#submit'][] = 'locale_form_language_admin_add_form_alter_submit';
$form['custom_language']['submit']['#submit'][] = 'locale_form_language_admin_add_form_alter_submit';
}