https://musicbrainz.org/admin/wikidoc currently says "There was a problem accessing the wiki API." and lists a bunch of "Error!"s for the "Wiki version" column.
I dug around a bit in the code and noticed https://github.com/metabrainz/musicbrainz-server/blob/bc9e8dacacb5987622148b360f370f6f55893dca/lib/MusicBrainz/Server/Data/WikiDocIndex.pm#L101 which makes MBS contact DBDefs->WIKITRANS_SERVER_API over http://, which I assume was broken by MBH-473.
Likely either DBDefs->WIKITRANS_SERVER_API should be changed to also take the protocol as an argument or WikiDocIndex should be https:// instead, possibly breaking anyone having set up their own wiki. (Has anyone really done this?)