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

- Librarian Bot: Add language metadata for dataset (18fe59c60674dc3b87da5bb18f47c9b39bfe74f0)


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

README.md

@@ -1,4 +1,6 @@
 ---
+language:
+- ja
 dataset_info:
   features:
   - name: text