I propose to replace "you may click Submit again" by "you may click "Save page" again"; as this way it will be simpler to understand if e.g. the savearticle message is translated to a language, while the abusefilter still falls back to English. Additionally the button is not even labelled "Submit" in English!
I think the problem here is that AbuseFilter can filter not only edits, but also page moves, deletions etc. So the name of the button can vary.
I tweaked the message to be so generic, it must be correct now :).
Yes, but it still says "this edit", while the AbuseFilter can (at least, I don't know if more) also prevent page moves, as Nemo said.
Should we call it "contribution" or is this MediaWiki jargon? Or maybe "action", superusers might think of "log action" but it should be clear enough for most people.