Thanks for bringing this to our attention. This was not from tweaking around but because we installed 3.0.0 Beta in a production environment so users could catch things like this. I'm not sure why this wouldn't have happened in earlier versions, but it's appearing now.
The problem here is that the error is not being fetched, it's just spitting out the phrase name. This happens for all special pages or uncreated pages when the user doesn't have moderator permissions. This was really only intended if an article was soft-deleted.
As this has some serious implications regarding the visibility and edit-ability of the wiki, this has been fixed in the current ZIP (the broken phrase has been fixed for the next build). In vault/tabs/special_tab_article.php, find:
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