Fix language and license tag names and license tag

README.md

@@ -3,10 +3,10 @@ annotations_creators:
 - no-annotation
 language_creators:
 - found
-languages:
+language:
 - en
-licenses:
-- Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License
+license:
+- cc-by-nc-sa-4.0
 multilinguality:
 - monolingual
 size_categories: