Changing display texts to language 1 or language 2

Image Fig. SETTINGS/Language with selected languages and function keys.
Function key Language 1 / Language 2:

This function key refers to the language which appears in the line of text to the right of the key.
-Press this function key to change the display texts to the language named in the line of text.
 The function key will be marked with a colour and all texts in the infotainment system will be displayed in the specified language.

 Choosing the language for interface