Both the VGA fonts for terminal and Helvetica fonts don't support slavic characters

I am on latest Xubuntu which I unfortunately installed in Czech language because I didn't know this would be an issue later, problem with Xubuntu is that once you install it in specific language, you can't just switch back to English as all the folders and stuff already use czech translations. So maybe it would be nice if those fonts did support slavic characters.

I am talking about: "ěščřžýáíé"

As you can see, in both titles and terminal, these characters look weird