Decimal separator

Hello to everyone!
Does someone knows how to modify the default decimal separator of a currency field?
I found this on the web but it works only to change the courrency symbol..

https://github.com/orbeon/orbeon-forms/blob/master/src/resources-packaged/config/properties-xforms.xml

Ty to everyone!

Arturo.

Hello.. does someone have an idea about how to resolve this problem?
Thanks!

Hello..
can someone help me?
Is my question bad explained?
Am I too hasty?
Tanks.