The Sys Specs state PS4 isn't supported:
Q: Does PowerStore 4 work with non-US currencies?
A: PowerStore is not configured to support stores outside of the United States. Custom changes to the currency symbols that are displayed throughout the store will need to be made if you wish to use this system in another country.
These changes are not supported by WebAssist staff and should only be performed by someone familiar with code and comfortable with making these modifications.
Hopefully, PS5 will allow this.