Add bulk vehicle repair functionality in Falukant module

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

backend/controllers/falukantController.js

@@ -221,6 +221,10 @@ class FalukantController {
             (userId, req) => this.service.repairVehicle(userId, req.params.vehicleId),
             { successStatus: 200 }
         );
+        this.repairAllVehicles = this._wrapWithUser(
+            (userId, req) => this.service.repairAllVehicles(userId, req.body.vehicleIds),
+            { successStatus: 200 }
+        );
 
     }