Are you are working with XSLT WebParts (eg: People Search Core Results WebPart) and the special characters like ä, ë, é, ö, etc are getting replaced with a question mark (?) or a Square Box ? Let's change that then:
So basically the encoding of the XSLT is set to "iso-8859-1" by default and we will have to change it to "utf-8." Here is how to change the encoding: Find in your XSL file, the following line:
and change it to:
Now all the special characters should be visible perfectly.