As you can see, the text of the link and the href is stored at a system message.
Ok, thank you, it works! but now I have to learn how to do it using $wgUseDatabaseMessages = false; because I'm using the es.wikipedia.org spanish messages and with those ones it doesn't work yet!
thanks!,
Pablo
array( 'text'=>'allpages', 'href'=>'allpages-url]]' ), array( 'text'=>'categories', 'href'=>'[[categories-url]]' ),