[Plugin: Improved Include Page] "foreign" characters within read more link

I’m using this plugin in a page in spanish. SO I Want to have the “Read more” links be “leer más”. But I can’t get the accented character to work.

I have tried:

<?php iinclude_page(31,'&displayTitle=true&titleBefore=<h3>& more=Leer más'); ?>
<?php iinclude_page(30,'displayTitle=true&titleBefore=<h3>& more=Leer m\ás'); ?>
<?php iinclude_page(30,'displayTitle=true&titleBefore=<h3>& more=Leer m\&aacute;s'); ?>
<?php iinclude_page(30,'displayTitle=true&titleBefore=<h3>& more=Leer m&aacute;s'); ?>

It results on either a “weird” character (first 2 options) or nothing (second 2).
How can I make this works?

http://ww.wp.xz.cn/extend/plugins/improved-include-page/