Wi-Fi settings - Load MUI file fail - ASUS P552w

[Guest SdKfz.171]

Hi,

from yesterday, when I'm trying to access Wi-Fi settings (Wireless networks -> Settings -> Wi-Fi settings) "Load MUI file fail" error appears? I'm still able to connect to my home Wi-Fi network, but some apps are unable to detect the connection.

Any suggestions how to fix this?

Do I have to hard-reset my device?