Have a look here, there is a token you can use to display currency in the locale of the user:
https://docs.mendix.com/refguide/parse-and-format-decimal-function-calls/
formatDecimal(1234.56, 'ยค #,##0.00')
Have a look at the Decimal Tools module in the Marketplace.
It has a more fully featured version of the formatDecimal command that lets you specify the separator so you don’t have to use what is specified for your locale like the built-in version of the command.
https://marketplace.mendix.com/link/component/119981
Hope this helps.