concept translation module added

modified:
gnowsys-ndf/gnowsys_ndf/ndf/views/page.py
gnowsys-ndf/gnowsys_ndf/ndf/views/methods.py
gnowsys-ndf/gnowsys_ndf/ndf/templates/ndf/node_edit_base.html
gnowsys-ndf/gnowsys_ndf/ndf/templates/ndf/translation_page.html
gnowsys-ndf/gnowsys_ndf/ndf/models.py