Librarian Bot: Add language metadata for dataset (#2)

- Librarian Bot: Add language metadata for dataset (9a11d42e800237211dbbf80e38e634a737550cb9)


Co-authored-by: Librarian Bot (Bot) <[email protected]>

README.md

@@ -1,4 +1,7 @@
 ---
+language:
+- ja
+- en
 license: apache-2.0
 task_categories:
 - text-generation