<!–nextpage–> combined with wp_link_pages(), that’s ok?

Hello, I’ve included in index.php

wp_link_pages('before=<p><strong>Páginas:</strong>&after=</p>&next_or_number=number&pagelink=%');

just after tag: <div class=”entry”>

and in the post use <!– nextpage –>

However, the result is always the same: “Page 1 2” when it should be: “Páginas: 1 2”.

Could you tell me what I’m doing wrong. Thank you