adjust the path to the translation files
they were renamed from qtshark_... to wireshark_...

Change-Id: I97b245a9028b4ed99812204114ba8f59357d49e8
Reviewed-on: https://code.wireshark.org/review/3995
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>