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

- Librarian Bot: Add language metadata for dataset (45c3eef86b20192a34f2d087ae3d28e4e4801b63)


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

README.md

@@ -1,4 +1,6 @@
 ---
+language:
+- ja
 dataset_info:
 - config_name: JCoLA
   features: