In the EU we are grouped in with the Russian servers. Default UI and Prat support the Cyrillic alphabet. Glass doesn't and just displays questionmarks.

See https://imgur.com/a/udboDsZ for example.

That's a good point.

I checked and it's set to Friz Quadrata TT, size 14 and no outlines.

Thanks for the report!

This is usually a font issue... Are you using a font that's compatible with Cyrillic characters? I'm using Friz Quadrata TT (default WoW font) and they display fine.

Strange! Might be differences in wow client locales or something. But I'm glad you found a working font!

Closing this issue now.

I switched to another font and that works. Friz Quadrata TT doesn't work though :)

Just want to add for the tinkerers out there that the Cyrillic version of Friz Quadrata has its own path:
Fonts\FRIZQT___CYR.TTF