Index: wp-admin/edit-tags.php
===================================================================
--- wp-admin/edit-tags.php	(revision 21358)
+++ wp-admin/edit-tags.php	(working copy)
@@ -388,7 +388,7 @@
 	do_action('add_tag_form_fields', $taxonomy);
 do_action($taxonomy . '_add_form_fields', $taxonomy);
 
-submit_button( $tax->labels->add_new_item, 'button' );
+submit_button( $tax->labels->add_new_item );
 
 // Back compat hooks. Deprecated in preference to {$taxonomy}_add_form
 if ( 'category' == $taxonomy )