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 German mediatization 

In the second paragraph of the article on German mediatization, I see ""secularization"", spelled with a ""z"", and ""secularised"", spelled with an ""s"". Is that right? Shouldn't they be spelled the same, both with ""z"" or both with ""s""? I notice that the title is ""mediatization"", with ""z"". I don't care either way; I just prefer consistency. What do you think?  "