The nav system has 7 full language sets built in:
DE, GB, US, ES, IT, FR, NL
...plus Russian RU (voice only)

The nav system OS sets the language on the nav, and tells the car what language to use.

The Instrument Cluster and the Light Control Module both send text messages to the Check Control Display

The nav system tells the car what language to use, but for the check control messages the actual langauge text is stored in ROM in the LKM and the IKE.

BMW stored only 6 x languages in these ROMs: DE, GB, US, ES, IT, FR.

If you select a language in NavCoder that is not supported by the ROM, then it will revert to either the first language (as shown in the nav system) or default German.

ie: If you want NL for nav, and GB for the check control, set the nav system languages up as GB, NL, xx (xx = anything). When you select NL for nav, the Check Control will be displayed in GB

Likewise, if you want NL nav and DE for check control, select DE, NL, xx

Cheers, Jochen