Pingbacks is trackback
It's normal to view this text, else find the text in the En-US directory

skins/<skin>/_feedback.php ( or /skins/_feedback.php if that file looks really empty ;) )

find a bit that looks like this and change it to say what you want :

	$CommentList->display_if_empty(
								'<div class="bComment"><p>' .
								sprintf( /* TRANS: NO comments/trackabcks/pingbacks/ FOR THIS POST... */
													T_('No %s for this post yet...'), implode( "/", $disp_title) ) .
								'</p></div>' );

¥

That's it !

Thanks alot ;-)