Enhance FalukantService and UI components for improved product handling

- Updated FalukantService to allow optional inclusion of productType in queries, enhancing flexibility in data retrieval.
- Modified SaleSection.vue to conditionally display product information and size, improving user experience by handling cases with no product.
- Added new German translation for 'runningNoProduct' to enhance localization support for users.

backend/services/falukantService.js

@@ -1014,7 +1014,7 @@ class FalukantService extends BaseService {
             include: [
                 { model: RegionData, as: 'sourceRegion', attributes: ['id', 'name'] },
                 { model: RegionData, as: 'targetRegion', attributes: ['id', 'name'] },
-                { model: ProductType, as: 'productType', attributes: ['id', 'labelTr'] },
+                { model: ProductType, as: 'productType', required: false, attributes: ['id', 'labelTr'] },
                 {
                     model: Vehicle,
                     as: 'vehicle',