Main “problem” with this menu is that it basically runs on GTA’s pause menu backend.
I thought that adding “謝謝你</font face>”, which is the same as “SetTextFont(0)”, instead of “謝謝你” could make it work, but as it turns out…pause menu relies on game language to work.
So, as a TL;DR, if you want to use a language that is not supported by the default GTA scripts, you need to set your game language.
Scaleforms use their own fonts most of the time. There are only a couple of scaleforms that allow custom fonts, but we don’t use them here.
Here’s an interesting read related to this: Using HTML, images and blips in scaleform/texts