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

- Librarian Bot: Add language metadata for dataset (fb15ff68d90d1ecf1e05bddb7e926fd45980040a)


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

README.md

@@ -1,3 +1,5 @@
 ---
+language:
+- cs
 license: apache-2.0
 ---