How to get a proper UTF-8 HTML with umlaut

[<markus.sticker.epos@zf.com>]

Hi,

I tried to get HTML with characters like Ü, Ä, Ö .
Just I used th ISO-8851-9 (default), but today we 
had to change the encoding to UTF-8. So I read 
many thing about that:

Using xsltproc with --stringparam chunker.output.encoding UTF-8
Or 
Setting the xslt-output to

  <xsl:output method="xml"
              encoding="UTF-8"
              doctype-system="http://www.w3.org/TR/html4/strict.dtd";
              doctype-public="-//W3C//DTD HTML 4.01//EN" />
  or
  <xsl:output method="html"
              encoding="UTF-8"
              doctype-system="http://www.w3.org/TR/html4/strict.dtd";
              doctype-public="-//W3C//DTD HTML 4.01//EN" />

But all I've got is .

  ShowExt überarbeitet

Instead of
 
 ShowExt überarbeitet

Maybe somebody can give me a hint how to change this.
Thanks and
Best regards

Markus