Fix bug where Preferences checkbox didn't reflect default value of menubar being covered (YES).

Setting then binding does actually work on 10.8, but it's rather hackish and doesn't work in 10.6.

Now we set NSUserDefaultsController initial values in multiple places, add a category that makes it (mostly) foolproof.
Put help back in English.lproj.

It wasn't reliably being retrieved in the unlocalized resources folder in Mac OS X 10.6, despite being documented as supported.  (Worked fine in 10.8, though).
Access NSWindowCollectionBehavior constants consistently.
Shroud 1.2b1