What users are wanting to do are interwiki. Interwiki are attributions of another language. You are using the word "plagiarism" badly, because plagiarism is a term for those who sell it and it improves it and re-sells it. The wiki is not being plagiarized, so I see, if not, translated and giving credits. With the interwiki, give credits.
Another thing, I have seen that it is protecting the articles to avoid the interwiki, something that is giving misuse. The protection of articles, are to avoid vandalism, not because you feel like it.
If you follow this way, everyone present, will quote the Staff. Because you threaten to block by attribution in a legal way. it Is rather disorienting. regards.