Scene Builder - add option to select property resource bundle

[Pedro Duque Vieira]

Hi,

I wanted to propose adding an option to the Scene Builder so that one could
choose a property resource bundle to see how the interface appears
after Internationalization and localization.
Right now I can only see the the UI with the strange strings that are the
keys of the resource bundles, which interferes in previewing how my UI will
look like.

Thanks, best regards,

-- 
Pedro Duque Vieira