Just a thought could a QRpedia scan with translation app be a down load option for people, the app could offer preferred language, plus an alternate language,
the reader would check out those two language WP for an article; Once a person has the app they can make their own choices, modify language options as they want
if neither is available then it offers a google translation from the local language to the persons primary language choice.

your phone is set to fr, sp
you go into a museum in germany(de)

case 1
scan a qr code it returns an article off de:wp which is also in en,fr,sp
you get fr version

case 2
its available in de, en, sp
you get the sp version

case 3
its available in de only
you get a google translation to fr