Improve errors reporting

virtweb_frontend/src/routes/EditNetworkRoute.tsx

@@ -25,7 +25,7 @@ export function CreateNetworkRoute(): React.ReactElement {
       navigate(`/net/${res.uid}`);
     } catch (e) {
       console.error(e);
-      alert("Failed to create network!");
+      alert(`Failed to create network!\n${e}`);
     }
   };
 
@@ -59,7 +59,7 @@ export function EditNetworkRoute(): React.ReactElement {
       navigate(NetworkURL(network!));
     } catch (e) {
       console.error(e);
-      alert("Failed to update network!");
+      alert(`Failed to update network!\n${e}`);
     }
   };