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.

frontend/src/i18n/locales/de/falukant.json

@@ -316,7 +316,21 @@
                 "noVehiclesSelected": "Keine Fahrzeuge ausgewählt.",
                 "sendSuccess": "Fahrzeuge erfolgreich versendet!",
                 "sendError": "Fehler beim Versenden der Fahrzeuge.",
-                "cancel": "Abbrechen"
+                "cancel": "Abbrechen",
+                "close": "Schließen",
+                "repair": "Reparieren",
+                "repairTooltip": "Fahrzeug reparieren",
+                "repairVehicleTitle": "Fahrzeug reparieren",
+                "repairVehicleType": "Fahrzeugtyp",
+                "repairCurrentCondition": "Aktueller Zustand",
+                "repairCost": "Reparaturkosten",
+                "repairBuildTime": "Reparaturdauer",
+                "repairBuildTimeInstant": "Sofort",
+                "repairBuildTimeHours": "Stunden",
+                "repairBuildTimeMinutes": "Minuten",
+                "repairConfirm": "Reparieren",
+                "repairSuccess": "Fahrzeug wird repariert!",
+                "repairError": "Fehler beim Reparieren des Fahrzeugs."
             },
             "stocktype": {
                 "wood": "Holzlager",