move tbb resources in bn to bn-BD
there is no bn in Firefox, so with gk we decided to provide bn-BD instead.
I need to make the changes in majus' branches.
My aim is to do this on the translation branches:
abouttor-homepage browseronboardingproperties tor-launcher-network-settingsdtd tor-launcher-properties torbutton-aboutdialogdtd torbutton-abouttbupdatedtd torbutton-branddtd torbutton-brandproperties torbutton-torbuttondtd torbutton-torbuttonproperties