Custom symbols in Currencies Bar

Hi,
1. on the design section, flag custon is not working to me: “Some countries use the same currency. You can choice flag correctly. Each line is the flag. Structure [currency_code,country_code]. Example: EUR,ES” And still showing European Union flag intead of Spain flag.

2. I would like to show custom symbols or letters instead of currency codes, that is ”$” instead of “USD”, “€” instead of “EUR” and so. I mean custom symbols in the Currencies Bar.

USD=$
VES=Bs.S
EUR=€

Thanks in advance.