Elwig: Use 'Menge' instead of 'Gewicht' where applicable

Elwig/Services/DeliveryService.cs

@@ -946,7 +946,7 @@ namespace Elwig.Services {
 
             var weight = await deliveryParts.SumAsync(p => p.Weight);
             wText = $"{weight:N0} kg";
-            wGrid.Add(("Gewicht", null, weight, null, weight));
+            wGrid.Add(("Menge", null, weight, null, weight));
 
             if (await deliveryParts.AnyAsync()) {
                 var kmwMin = await deliveryParts.MinAsync(p => p.Kmw);