Make sure fonts support different languages

AndyBrandt

I am creating a Mural in Polish and I discovered that only the basic font - Proxima Nova - supports/contains Polish characters (ółśććńężź). This limits me to this one font, I can't use the others. I am sure the problem is the same in other languages which have additional chars besides the basic latin alphabet.

Ability to add fonts from Google Font or in some other way (upload?) would possibly solve this.