Add vehicle repair functionality in Falukant module

- Implemented a new repairVehicle method in FalukantService to handle vehicle repairs, including cost calculation and precondition checks.
- Updated FalukantController to expose the repairVehicle endpoint, allowing users to initiate repairs via the API.
- Enhanced FalukantRouter to include a new route for vehicle repairs.
- Modified BranchView component to add UI elements for repairing vehicles, including a dialog for repair confirmation and displaying repair details.
- Updated German localization files to include translations related to vehicle repair actions, improving user experience for German-speaking users.

backend/controllers/falukantController.js

@@ -217,6 +217,10 @@ class FalukantController {
         this.getBranchTransports = this._wrapWithUser(
             (userId, req) => this.service.getBranchTransports(userId, req.params.branchId)
         );
+        this.repairVehicle = this._wrapWithUser(
+            (userId, req) => this.service.repairVehicle(userId, req.params.vehicleId),
+            { successStatus: 200 }
+        );
 
     }