Fix language and license tag names and license tag

README.md

@@ -3,11 +3,11 @@ annotations_creators:
 - no-annotation
 language_creators:
 - crowdsourced
-languages:
+language:
 - en
-licenses:
-- cc-by-4-0
-- gfdl-1-3-or-later
+license:
+- cc-by-4.0
+- gfdl
 multilinguality:
 - monolingual
 size_categories:
@@ -171,6 +171,8 @@ Github awesome programing code repos.
 
 ### Licensing Information
 
+GNU Free Documentation License v1.3 or later.
+
 For research use only.
 
 ### Contributions