https://bugzilla.wikimedia.org/show_bug.cgi?id=55000
--- Comment #3 from Kunal Mehta (Legoktm) legoktm.wikipedia@gmail.com --- In the init part
self.setSource(pywikibot.Site().language())
might also need changing.
Currently, if in the config file there is
family = 'wikipedia' mylang = 'en'
and claimit is called with
-cat:zh:Category:Somevalue
this leads to "en" to be used, instead of "zh".