Improve UX for users looking to replace the movie files in their submissions

[YoshiRulz]

[vadosnaprimer]

If people cancel and resubmit to fix a minor mistake, they haven't read Submission Instructions. I think the link we need within the description of that Movie file field is https://tasvideos.org/SubmissionInstructions#UpdatingTheSubmissionFile

Maybe just say there "if you need to do a minor fix to the movie, here's how"

Since embedding wiki specific links into code is not nice, a better approach would be to have a system page with the necessary text, and using it as the description of the field.

[vadosnaprimer]

OK so please put an alert-info instead, at the top of submission edit page, and have a system wiki page whose text will be embedded there, similar to how Submissions/Submit embeds System/SubmitMovieHeader

[YoshiRulz]

Sorry for the churn.

I copied what the Submit page had, is that all that's necessary?

[vadosnaprimer]

Works perfectly now!