Multiple wordpress using one gallery

I have a page with different language versions
http://www.mysite.no (Norwegian wersion)
http://www.mysite.no/uk (english version)
http://www.mysite.no/de (german version)

I would like to only manage 1 gallery (norwegian version) for all these
sites.

How can i make the UK and DE pages use the gallery I have in the norwegian page.

All three pages are separate wordpress installations?
I’m using NextGEN gallery.