Replacing flag png icons with my own SVG icons

Hi there,

I was told that it was possible to swap the png flags used by the currency selector widget (I’m using the shortcode ‘[woo_multi_currency_layout10]’ to display the widget currently) with my own set of custom svg flag images. How would I do this please?

Also, the selected currency in the currency selector widget currently displays the currency code in parentheses, is it possible to remove these using some code or the template file please?
It currently displays as:
[flag] (USD) $