LCC12 — Clean up ISO 639-1 language codes per the latest updates on the Library of Congress web site

There are minor differences in naming for various natural languages that should be updated, and the LoC has now published linked data codes for the ISO 639-1 languages that can be added to augment what we currently have for consistency. These changes mainly impact the language codes ontology for ISO 639-1 with minimal impact on the specification document itself.

Include Library of Congress links in the ISO 639-1 language codes

The correction for this issue is to add owl:sameAs axioms to each of the language individuals to point to the relevant links on the Library of Congress web site, and modify references to the language names expressed in English, French and/or German to match what the LoC publishes in a handful of cases where there were differences.

This resolution reflects a change to the machine readable file for the ISO 639-1 Language Codes. It also requires a change to the specification, in Section 8.4 Ontology: ISO 639-1 Language Codes.