Potential fix for code scanning alert no. 4: Information exposure through an exception

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: GitTimeraider

app/directadmin_api.py

@@ -442,7 +442,7 @@ def create_forwarder(self, address, destination):
             print(f"Error creating forwarder: {e}")
             import traceback
             traceback.print_exc()
-            return False, str(e)
+            return False, "An error occurred while creating the forwarder"
 
     def delete_forwarder(self, address):
         """Delete an email forwarder"""