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I am myself from a country that does not use English as an official language, and is not far from that area but is not there itself. Those who talked to me on server and I consider my buddies know more. :D
And yes I do talk English on the server, because that is what the people here know, and as it is mostly for children it seems logical that players come from those contries that mostly speak English. You are welcome to play, no one is gonna judge you based on your language skills or from where you are. Only thing that matters is to be friendly.
I myself record in OBS Studio, https://obsproject.com/
It is free, even open source and its for Linux and Mac too! Allows also streaming.