Re: [NTG-context] Greek: GR or EL? Czech: CZ or CS? UK: Ukrainian or ...

No! "deo" ist modern German in old orthography (pre-2005).

OK, so I guess that's what RFC 4646 suggests de-1996 for -- I suppose the reform was first introduced in 1996 and adopted only later? See ftp://ftp.rfc-editor.org/in-notes/rfc4646.txt, page 13 (Mojca, the preceding paragraph is for you ;-) Arthur