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

- Librarian Bot: Add language metadata for dataset (72c426f2357b7a7ad1c4d8c54f26945ffb75786c)


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

README.md

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