Delete legacy JSON metadata

add dataset_info in dataset metadata

remove dummmy data

Add `language_bcp47` tag (#4753)

Align more metadata with other repo types (models,spaces) (#4607)

Support streaming UDHR dataset (#4487)

Update dataset_infos for udhr dataset (#4362)

Update datasets task tags to align tags with models (#4067)

Update files from the datasets library (from 1.18.0)

Update files from the datasets library (from 1.7.0)

Update files from the datasets library (from 1.6.0)

Update files from the datasets library (from 1.3.0)

Update files from the datasets library (from 1.2.0)