Hi. I'm from Malaysia and able to help you to test your app.
Just that you did not specify what equipment we need to have. Do we need to have VR to test.
By the way, I can do it in 4 of the language you mention, Chinese Simplified, Chinese Traditional, English and Malay.
I'm Malaysia Chinese, Chinese is my mother tongue. We study both simplified and traditional in school. Malay is our national language. Can also be consider native language. So as English.
So you can be assure that all the language that I propose is near native if not native.
Do chat with me on this. I might need at least some simple guidance on how to test.
I am an tech savy too.
Regards,
Tony