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Re:Raygui – A simple and easy-to-use immediate-mode GUI library by grishka on Sunday March 27, 2022 @06:14AM (#30819119)
Seeing that it uses char* for strings, I'd also assume it doesn't support unicode and thus non-Latin scripts.
Re:Raygui – A simple and easy-to-use immediate-mode GUI library by sunout2 on Sunday March 27, 2022 @07:39AM (#30819479)
Raygui supports unicode for input and output.

https://github.com/raysan5/raygui/issues/99