decimal point - european format

Hello,

I am from Belgium (Europe) and this is my problem with postgres:

SET DATESTYLE TO 'ISO';

Ok, that's what I want for the date (2001-04-29)
but the format for the floating point number is not correct.

1.05 should be 1,05

How do I solve this ???

(nothing found on google on this subject)

Thanks for you time,

Pierre.