Reorder split names

Reorder split names in the YAML metadata to be aligned with the order in the loading script.
See: https://github.com/huggingface/datasets/issues/5258

README.md

@@ -130,15 +130,15 @@ dataset_info:
           44: Welsh
   config_name: full
   splits:
-  - name: test
-    num_bytes: 1877970
-    num_examples: 5963
   - name: train
     num_bytes: 7116761
     num_examples: 22194
   - name: validation
     num_bytes: 1855233
     num_examples: 5888
+  - name: test
+    num_bytes: 1877970
+    num_examples: 5963
   download_size: 3761951178
   dataset_size: 10849964
 ---