ApplicationWindow: minor cleanup & spelling fixes
ApplicationWindow: minor cleanup & spelling fixes

Change-Id: Ib80c3b6c5591da0760ef40840bbda5c6efc37b42
Reviewed-by: Caroline Chao <cb6a0059f4e516e853a34cb558c25ca5a9bcf4ab@digia.com>

mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,richardmg/qtcomponents,kobolabs/qtquickcontrols,mizukusak/qtquickcontrols,richardmg/qtcomponents,jfaust/qtquickcontrols,richardmg/qtcomponents,jfaust/qtquickcontrols,jfaust/qtquickcontrols,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols