Cannot run calibre-debug -g

unknown locale: UTF-8`

Hello.

I have managed to successfully install Calibre on my RMBP in the normal dmg way.

When I try to run the commands 'calibre-debug -g', I get the output: `ValueError: unknown locale: UTF-8`
https://pastebin.com/przZsvdg

If anyone can help point me in the right direction so that I can continue to figure out how to be involved in Calibre development.

thanks.