Those who're suffering from not being able to render non-english unicode letters

[UponTheSky]

I was struggling this for a long time then I found the solution.
You need to change the Skin's Font property, not each and every Text's.

So from Plugins > SimpleFileBrowser > Skins, choose either Light/DarkSkin, and open its properties dialog(I usually use right mouse click). On the dialog, you'll see General > Font property. Change into the font that you want. That's it.