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

@@ -5,22 +5,22 @@ language_creators:
 - crowdsourced
 - machine-generated
 language:
-- en
-- zh
+- ar
 - de
+- en
 - es
 - fr
+- hi
 - it
 - ja
 - nl
 - pl
 - pt
 - ru
-- ar
-- vi
-- hi
 - sw
 - ur
+- vi
+- zh
 license:
 - mit
 multilinguality: