Support multiple source and target languages when generating metadata
Support multiple source and target languages when generating metadata

jsenellart-systran/OpenNMT,jsenellart/OpenNMT,monsieurzhang/OpenNMT,jsenellart/OpenNMT,jungikim/OpenNMT,jungikim/OpenNMT,OpenNMT/OpenNMT,monsieurzhang/OpenNMT,jsenellart/OpenNMT,da03/OpenNMT,jungikim/OpenNMT,da03/OpenNMT,jsenellart-systran/OpenNMT,jsenellart-systran/OpenNMT,OpenNMT/OpenNMT,da03/OpenNMT,OpenNMT/OpenNMT,monsieurzhang/OpenNMT