Honestly, LesIzmoor isn't incorrect for the text source. On windows, the text implementation in comparison to the old version just sucks. The reason why this is is because the text implementation is a multiplatform implementation that is very generalized and limited, and actually uses a text rendering library for rendering rather than the operating system. I'm just going to implement the older version either as-is or maybe even try DirectWrite at some point get the best text support possible on windows. I don't blame you if you choose to do that for the time being. I may actually bump up priority on this in fact.
That being said, if you do want to work with it, the issues with, say for example, chinese text not displaying are due to the language, it's because the font itself does not have unicode glyphs. You have to use a unicode font or chinese-specific font to get it displaying.
I will attempt to implement the older text support again. It was actually really nice on windows, so I'll see what I can do. Again I'm probably going to bump up priority for this.