Added names of less-studied languages
OK, I removed Glottolog codes and only added ISO 639-3 ones. The former are for the moment in corpus card description, language details, and in subcorpora names. The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_4880). All of your documentation changes will be reflected on that endpoint.
Added names of less-studied languages (nru – Narua and jya – Japhug) for existing datasets.