Better error message for batch again

app.py

@@ -70,10 +70,12 @@ def process_inputs(smiles: str, file_obj):
             total = len(smiles_list)
             valid = total - len(invalid_smiles)
             if invalid_smiles:
+                invalid_count = len(invalid_smiles)
                 msg = (
-                    f"{valid} SMILES were successfully processed, "
-                    f"{len(invalid_smiles)} had errors:\n"
-                    + "\n".join(invalid_smiles)
+                    f"{valid} SMILES processed successfully. "
+                    f"{invalid_count} entr{'y' if invalid_count==1 else 'ies'} "
+                    f"could not be parsed by RDKit:\n"
+                    + "\n".join(f"- {sm}" for sm in invalid_smiles)
                 )
             else:
                 msg = f"Processed batch of {valid} SMILES. Download embeddings.csv."