I'm very confused on how proposals get closed. All closed proposals I've seen were closed by a moderator. However, when I tried to delete my past proposal, it said something like "Wait for 2 days to delete to allow for editing and possible reopening". That makes it sound like non-moderators can close/reopen proposals. I have the privilege to close/reopen example questions, but there are no close/reopen buttons on proposals.
Who can vote to close/reopen proposals?