Umlauts on my website are not displayed.

If umlauts are not displayed correctly on your website, i.e. as üäö but e.g. as 'ß' or as a black diamond symbol with a ?, this is due to an incorrect character set in your website.

If you do not specify a character set explicitly, the server always delivers the web pages in the UTF-8 character set.

You can correct the charset for your website e.g. with a simple entry in the .htaccess file.

Extend the existing .htaccess file with the following line:

php_value default_charset ISO-8859-1