I don't think that a message that indicates success or failure like that is possible due to browser security problems. As for the link to the newly created wiki, we got complaints about opening the new wiki in the same window because people clicked on the link before the site was finished saving (because we can't do a test to ensure it was successful or that it has finished) and by using the same browser tab instead of opening a new one they lost their progress up to that point, so we have the link open a new tab instead.
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