http://www.icyphoenix.com/viewtopic.php?f=35&t=7019&p=48609#p48609
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Mighty Gorgon
Fri 02 Apr, 2010 10:00

Re: RSS Language Problem...
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If your DB charset is set to UTF-8, if you set your lang charset to UTF-8 in lang_main_settings, then you can try to do this:

OPEN [b]rss.php[/b]
FIND
[codeblock]			$topic_title = utf8_encode($topic_title);
			$post_subject = utf8_encode($post_subject);
			$message = utf8_encode($message);[/codeblock]

Remove all [b]utf8_encode[/b] from there...

I am not sure that it will work fine... but you can try.