It can happen that umlauts are not displayed correctly on your website.
For example, it may say: WÄhlen

This is often caused by an incorrect definition of the character set on the website.

Please check whether the correct character set is defined in the head area of your website. The code could look like this: <meta charset="utf-8"/> 

As soon as the character set has been defined correctly, the problem with the umlauts should disappear.