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The interwiki link

[[nap:Cità d''o Vaticano]]

is not recognized as such but rather rendered as text:

[[nap:Cità do Vaticano]]

with charaters followig the "d" rendered in italics.

This is likely not the intended behaviour. In page

http://ksh.wikipedia.org/w/index.php?title=Fattikahn

, I tried: 

[[nap:Cità d'<nowiki />'o Vaticano]]

which does not work as an interwiki link, and was quickly undone by an interwiki bot. The same with:

[[nap:Cità d<nowiki>''</nowiki>o Vaticano]]

The page title "Cità d''o Vaticano" works in the Napolitan Wikipedia without problems, it seems to me.