Replace YAML keys from int to str

Replace YAML metadata integer keys with strings, as the Hub does not support integers.
See: https://github.com/huggingface/datasets/issues/5275

README.md

@@ -17,7 +17,6 @@ source_datasets:
 task_categories:
 - translation
 task_ids: []
-paperswithcode_id: null
 pretty_name: IdPanlBppt
 dataset_info:
   features:
@@ -33,10 +32,10 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: Economy
-          1: International
-          2: Science
-          3: Sport
+          '0': Economy
+          '1': International
+          '2': Science
+          '3': Sport
   config_name: id_panl_bppt
   splits:
   - name: train