"Česky" or "Čeština"?

Fragment of a discussion from User talk:Mormegil

I prefer the adverb for interwiki links because I would understand the interwiki link text as "in Czech", "in Upper Sorbian", "in Polish" etc. Behind the interwiki link is no page about a language but the article in the corresponding language. But I think the Polish form Polski is an adjective, the adverb should be po polsku.

Michawiki (talk)‎19:59, 10 April 2012
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