This documentation bug is still present and it just "hit" me. If upstream documentation is correct but it can't be used directly for DFSG issues, then I think this is a Debian specific bug and not upstream one.
I've coded a partial patch that fixes the english and italian documentation (only languages I speak), but I don't know how to make the dpkg-buildpackage command recompile the po/*.po files to their po/*.gmo binary format. If I `make distdir` they get recompiled without any errors, but then dpkg-buildpackage refuses to include them into the .deb package. My bad, I lack the skills.
If the maintainer decides my patch is any good, then we need to open a new bug report for the translation of the patch in all other languages and finally include the translations into my patch, before the maintainer can actually accept it and close this bug as fixed.