I am absolutely happy with the existing English language interface. It looks slick and nice. But when I give a presentation a name in Cyrillic it is displayed in ugly Arial. The same happens with form fields. It spoils the look. In the site font-family - "Poppins","Helvetica Neue",Helvetica,Arial,sans-serif - Arial is the first one with a Cyrillic charset.
Why not to add in this row a more stylish font with a Cyrillic charset?