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

- Librarian Bot: Add language metadata for dataset (54dcac1b6771cd073dedce893b176ef19c6f4a24)


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

README.md

@@ -1,4 +1,6 @@
 ---
+language:
+- ja
 license: cc-by-sa-3.0
 ---
 ## description