Since there's a great amount of players that play PRO but don't necessarily understand English, i think that adding a few channels between LOCAL and ALL that are tagged "Español" "Portuguese" "French" and others, depending on player demand, would help to prevent channels of overflowing with players asking for help or looking for others who speak their language.
In case the first one is not acceptable by the team, then i suggest that the log in screen has a notice with the commands to join official channels for different languages.
Example: "to join the english channel type command" "Para unirte al canal en español escribe command".
another suggestion would be that as soon as a player starts a new character and joins the world, a pop up screen shows up with the commands to add and join channels, as well as other important things to players that may not be as intuitive. in different languages if possible.
Thanks for the consideration.