Alright, you sent me down a bit of a rabbit hole and I learned something about PieFed today because of it. Apparently, the downvote button isn’t shown for a number of reasons, but in your case the reason it isn’t shown is because users with a total “reputation” (upvotes received - downvotes received) that is too low lose the ability to downvote. Your reputation is currently too low for the downvote button right now.
Reputation as a metric is intentionally something that a user is unable to see. That is reserved for admins to help identify potentially toxic users. My guess as for the intention of a feature like this is to limit the spread of negative influence that a (potentially) toxic user can cause from extensive downvoting.
As far as I can tell, the only other feature that you are locked out of with a low reputation like this is the ability to send private messages (definitely a spam/toxicity measure). Other than that, your account is fully featured.





Piefed gets pre-populated with some of the most common languages on the fediverse, but others are added as content is received in them. A mature instance like piefed.social probably had a pretty complete list, but it wouldn’t surprise me if others don’t have all the languages yet.