THIS IS SUPPOSED TO FAIL AT THE MOMENT.
Documentation for all the strings is already written
in translatewiki (see #6457), but not yet imported into GitHub,
so it's supposed to fail now, which is good because you shouldn't trust
tests that never failed :)
Once all the documentation strings are imported, this pull request
should be rebased, and then it's supposed to pass.
The extra string in values-qq/string.xml is also there
just to check that it fails as it should, and will be removed.
Resolves#6485.
