[Alberto]

SOLVED!

Now there is also the link:

<?php
   if (1 == get_comments_number()) { 
        printf(__('<a href="' . get_permalink() . '#comments"> 1 commento</a>', 'wp-portfolio') , number_format_i18n(get_comments_number()));
    }
    else { 
        printf(__('<a href="' . get_permalink() . '#comments"> %1$s commenti</a>', 'wp-portfolio') , number_format_i18n(get_comments_number()));
    }
 ?>