Add language tag (#1)

- Add language tag (d0fedaa61c8ca9927e270f25f990a667e3dae1f9)


Co-authored-by: Loïck BOURDOIS <lbourdois@users.noreply.huggingface.co>

README.md

@@ -1,6 +1,7 @@
 ---
+language:
+- en
 license: apache-2.0
-tags:
 datasets:
 - wikipedia
 - c4