Implement empty transport feature in DirectorInfo component

- Added functionality to allow directors to initiate empty transports without products, enhancing logistics management.
- Introduced a new transport form in the DirectorInfo component, enabling selection of vehicle types and target branches.
- Updated the i18n localization files to include new translations for the empty transport feature.
- Enhanced the BranchView to pass vehicle and branch data to the DirectorInfo component, ensuring proper functionality.
- This update aims to improve user experience and streamline transport operations within the application.

backend/migrations/make_transport_product_nullable.sql

@@ -0,0 +1,7 @@
+-- Migration: Make productId and size nullable in transport table
+-- This allows empty transports (moving vehicles without products)
+
+ALTER TABLE falukant_data.transport 
+  ALTER COLUMN product_id DROP NOT NULL,
+  ALTER COLUMN size DROP NOT NULL;
+