OGC API Multi-lingual support

[chris-little]

HTTP(S) supports language negotiation, but at the API resource level. Users of OGC APIs, such as Records and EDR, have requested multiple language versions of some metadata in a single response, typically using IETF BCP47.
Many international standards have adopted such an approach. E.g. see https://raw.githubusercontent.com/w3c/sdw/gh-pages/time/rdf/time.ttl and search for prefLabel.
To ensure interoperability, this should this be part of OGC API-Common, rather than OGC API adopting inconsistent approaches.

[m-mohr]

Related work: https://github.com/stac-api-extensions/language