add lang+region qm file support and simplified/transitional Chinese language in Slicer_LANGUAGES#897

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u8621011 wants to merge 2 commits intoSlicer:masterfrom

u8621011:dtc18n

Commits on Feb 23, 2018

ENH: Enable i18n support as default and add lang+region qm file support
u8621011
committed
ENH: set default value of Slicer_BUILD_I18N_SUPPORT to off
u8621011
committed