Add support for RightToLeft languages

[annejan]

Since we want this app to be translatable to all languages, this will need some love.

More information on how to do this: http://stackoverflow.com/questions/18547867/qt-demo-with-arabic-support.
http://stackoverflow.com/questions/3365753/layout-direction-for-arabic-is-not-determined-based-on-the-locale-mac-and-linux

[annejan]

Just translate LTR in main.cpp to RTL for a layout flip . .