Submit handler for the forms that have a language_configuration element.
function language_configuration_element_submit(&$form, &$form_state) {
// Iterate through all the language_configuration elements and save their
// values.
if (isset($form_state['language'])) {
foreach ($form_state['language'] as $element_name => $values) {
language_save_default_configuration($values['entity_type'], $values['bundle'], $form_state['values'][$element_name]);
}
}
}