Update Scotch.py

Scotch.py

@@ -110,7 +110,7 @@ class ScotchDataset(datasets.GeneratorBasedBuilder):
                 if not split in splitpaths:
                     splitpaths[split]=lang_split_files
                 else:
-                    splitpaths.extend(lang_split_files)
+                    splitpaths[split].extend(lang_split_files)
 
         return [
             datasets.SplitGenerator(