Add `language_bcp47` tag
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2022-07-27T13:37:40Z
https://github.com/huggingface/datasets/pull/4753#issuecomment-1196774683
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2022-07-27T14:50:03Z
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Following (internal) https://github.com/huggingface/moon-landing/pull/3509, we need to move the bcp47 tags to `language_bcp47` and keep the `language` tag for iso 639 1-2-3 codes. In particular I made sure that all the tags in `languages` are not longer than 3 characters. I moved the rest to `language_bcp47` and fixed some of them.

After this PR is merged I think we can simplify the language validation from the DatasetMetadata class (and keep it bare-bone just for the tagging app)

PS: the CI is failing because of missing content in dataset cards that are unrelated to this PR