Some other translations linked from https://tour.golang.org/welcome/2 are not available either due to the same reason.
Should we file issues separately?
Should we delete the links from the official tour sites if they don't respond?
I would file an issue in the tracker of the translations that don't work. Optionally, we could turn this one into a meta-issue to coordinate the effort, with a bulleted list of the external issue we opened.