Language acronyms

There seems to be a lot of acronyms for languages and scripts around. A single approach should be chosen. For the moment the preferred approach is the one used by wikidata.

Some special cases are listed in the table:

Language	Wikidata	Wikipedia
Aromanian	rup	roa-rup
Min nan chinese	nan	zh-min-nan
Norwegian Bokmål	nb	no
Cantonese	yue	zh-yue