[global-south] About global-south listinfo

Hello,

While at Primavera Hacker Tor workshop I realized that the listinfo global-south text (https://lists.torproject.org/cgi-bin/mailman/listinfo/global-south) is on English and it wasn't that useful for some participants.

It makes sense to change the language to both Castellano and Portuguese, I can do this when I have the moderation list credentials.

Cheers, ~Vasilis