added opening messages to questions/activites/replication pages

[rtrunkhill]

Fixes issue 2520

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[plotsbot]

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[jywarren]

This looks good - just to double check, would you mind posting some screenshots to show each version, with the URL shown too?

Thank you!!!

[jywarren]

Oh wait, i see this is identical to #2831 -- i'm going to close this one so we just have one.