Phone/Mobile country flags only | WordPress.org

So this is my Telephone drop down list. (https://www.voxappeal.com/_en/Misc/phone-mobile.png)

I can’t translate the country names.
I can’t change the spacing/line height between lines (in general, for all multiple choice/dropdown lists). It seems there’s no specific CSS option to change this in dropdown elements?
The “i” from the next item shows through this list.
I can’t change the color of the country name (or national phone extension, although these are more visible).

Is there a way of showing only the flag?