wp-rss2.php do not display double-bytes languages

I set use_htmltrans=false to proper display Spanish characters. But the wp-rss2.php do not send the proper characters:
<img src=”http://www.pilas.net/~rodolfo/wp.jpg&#8221; alt=”http://www.pilas.net/~rodolfo/wp.jpg”&gt;
I also have problems with the planet python script, see: http://www.d-sur.net/planeta/
I tried to report this problem without succes at:
http://wordpress.org/support/index.php?action=vthread&forum=3&topic=3383