Alter the node add form in Drupal 7
If you want to change the Save button text to Submit in Drupal 7 add the following to your template.php file.
Simply replace YOURTHEME with the name of your theme and CONTENTTYPE to the machine name of your content type.
function YOURTHEME_form_alter(&$form, &$form_state, $form_id) {
if ($form_id == ‘CONTENTTYPE_node_form’) {
$form['actions']['submit']['#value'] = t(‘Submit’);
}
}

