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

@@ -37,12 +37,12 @@ dataset_info:
           7: Wissenschaft
           8: Kultur
   splits:
-  - name: test
-    num_bytes: 2756405
-    num_examples: 1028
   - name: train
     num_bytes: 24418224
     num_examples: 9245
+  - name: test
+    num_bytes: 2756405
+    num_examples: 1028
   download_size: 27160809
   dataset_size: 27174629
 ---