add alphanumeric label instead of icon for currency

[p92]

Please describe the problem the crypto icons are nice but not always easy to recognise

Describe the solution you'd like to see I'd like an option in each currency setting to input an alphanumeric ID for the currency and an option to display it instead of the crypto icon. IE : replace the icon by BTC for bitcoin, ETH for etherum etc...

Notes thanks for this nice widget :)