https://bugzilla.wikimedia.org/show_bug.cgi?id=55231
--- Comment #2 from Kunal Mehta (Legoktm) legoktm.wikipedia@gmail.com --- this came from a wrong (doc)-subpage on vi-wiki which was not "official". vi-wiki has a documetation template too which uses /doc subpages. Somebody meant he had to localize it to a new form with (doc) ending (I found only that example who gave the failure). I repared it [1] and I guess it should work as expected. I also found interwiki links between doc strings from subpage to subpage and deleted them.
[1] http://vi.wikipedia.org/wiki/B%E1%BA%A3n%5C_m%E1%BA%ABu:Ch%C3%BA%5C_th%C3%AD...