I did not add the tag "language:sp"... According to the change history this tag was added by the user "Sprachschule24" on 21 November 2019 - this sounds like the predecessor (or former name?) of this school.

They have been replaced by "MacFarlane" though, so I'd suggest to delete all "language:*" tags, as some of them could now be invalid. (Myself, I don't know what languages they are offering.)