It’s an artifact of the protocol. Because different lemmy instances exist and only federate here when someone from this instance subscribes you either need an instance that doesn’t block any federations and make that your home instance so the ALL designation actually encompasses all of your unknown unknowns or just settle for the ones people from this instance federate with. Either way, I think defaulting your language through settings is the easiest way to block the foreign languages content. The sports content is trickier to block because if you had like a browser plugin that just hides posts/communities with ‘Sports’ or ‘Teams’ in their titles you’d have the side effect of blocking non-sports related content (at least with the ‘teams’ one). I haven’t done any research personally into whether there are instances that have incorporated this as a feature or if anyone’s made a plugin like that though. Hope you find a solution!