Code review comment for lp:~deryck/launchpad/better-dupe-handling-ui

Here's a screenshot of the new warning for the UI reviewer:

http://people.canonical.com/~deryck/mark-as-dupe-warning.png

This was pre-imp'ed pretty heavily with Curtis at the Epic, almost so that I would feel okay doing ui=sinzui. However, we didn't really analyze the text of the warning together. I think the text has the word "duplicate" too much, but I cannot think of a better wording since I'm too close to the work. So I offer this for UI review, but I'll also get mrevell to take a look at the text.