Fix id field to avoid duplicate keys error

Fix id field to avoid duplicate keys error.

Fix #7.

um005.py

@@ -138,12 +138,8 @@ class UM005(datasets.GeneratorBasedBuilder):
                 for sentence_counter, (x, y) in enumerate(zip(u, e)):
                     x = x.strip()
                     y = y.strip()
-                    result = (
-                        sentence_counter,
-                        {
-                            "id": str(sentence_counter),
-                            "translation": {"ur": x, "en": y},
-                        },
-                    )
-                    sentence_counter += 1
-                    yield result
+                    id_ = f"{source}-{sentence_counter}"
+                    yield id_, {
+                        "id": id_,
+                        "translation": {"ur": x, "en": y},
+                    }