Add `language_bcp47` tag (#4753)

* fix ms_terms

* fix ted_talks_iwslt

* move tags to language_bcp47

* fix bad codes

* add language_details and language_bcp47 in DatasetMetadata

* more fixes

* fix wiki_dpr

Commit from https://github.com/huggingface/datasets/commit/aa48a29d1304167dff37cef0ed7542f29376ee2d

README.md

@@ -4,7 +4,6 @@ annotations_creators:
 language_creators:
 - crowdsourced
 language:
-- 'no'
 - af
 - aii
 - ajp
@@ -72,6 +71,7 @@ language:
 - myu
 - myv
 - nl
+- 'no'
 - nyq
 - olo
 - orv