1. "INIT" is a deceptive name because you can have zero documents open at any point, really.  So maybe name these `WINDOW_TITLE_STRING_NO_DOC` and `WINDOW_TITLE_STRING_DOC` ?
2. I think we should remove the parens in this case -- showing "MyProject - Brackets" looks more natural than "(MyProject) - Brackets" when there's no preceding filename