http://www.icyphoenix.com/viewtopic.php?f=35&t=4232&p=33696#p33696
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TheSteffen
Tue 04 Nov, 2008 23:25

Re: Where I Can Change The Rss Language?
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[quote user="Eric" post="33693"]I have the same problem: all feeds coming in unable to show german "umlaute" like ß, ä,ü,ö.
Could somebody explain, how to fix it!?[/quote]

Did you try this?

[quote user="KugeLSichA" post="28668"]
[b]
in the lang_main_settings.php[/b]
[code linenumbers=false]$lang['HEADER_XML_LANG'] = 'de-de';[/code]
[/quote]