How can I change Oracle error message to English??, I am getting the oracle error in Dutch.

Example:

FOUT in regel 1:
.ORA-01400: Kan geen NULL invoegen in ("ORADESA"."EMP"."DEPT_ID").
ORA-06512: in "ORADESA.NEWEMP", regel 29

I can not find any information about, if somebody know, please help me.

Thanks

Maite