Changed theme on export library/queue item windows also added functional 'cancel' buttons.
Merge remote-tracking branch 'upstream/development'
Merge remote-tracking branch 'upstream/development'

Conflicts:
	StaticData/Translations/Master.txt
Merge remote-tracking branch 'upstream/development'
Added code so that the 'Save As' window can only be opened once when the 'Save As' button is clicked multiple times.
Merge commit 'afe39e1c9d445ec13358e777763e43c77f7e13c2' into development