Hi, What you have is the following:

You navigation operating system has been modfiied so that the English text has been replaced by Dutch by someone. This is all the Dutch text you see.

The navigation map disc contains all the text for the REISINFORMATIE menus. The map appears to have had the Dutch 'Autovelox' added to it, but the person that added the info forgot to change all other menu text into Dutch. You can fix this bvy making a new map disc with the correct Dutch text

The TELEFOON I am not sure about - this may be text on the OS disc in the nav that was not changed (which you can fix), or it may be text generated by the telephone unit itself (which you cannot change).

I see your problem and recommend you try:
1) Make a new map disc with all the menus in Dutch

2) Determine what language was modified in your car - did they change English to NL, or German to NL?? Your instrument cluster self test may show you. Otherwise, you need to do a trial and error, or see which directoty on the map dis had the Autovelox added

3) for the Telephone you have to figure out where the language text comes from, and if from the phone, decide whether you want English or German.