Librarian Bot: Add language metadata for dataset (#1)

- Librarian Bot: Add language metadata for dataset (15cb43d87ff6ccd0a4460228449f0e648b51b0a9)


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

README.md

@@ -1,4 +1,6 @@
 ---
+language:
+- cs
 dataset_info:
   features:
   - name: tokens