add missing format string placeholder to title string

brian_dashboard_manager/templating/helpers.py

@@ -212,7 +212,7 @@ def get_nren_interface_data(services, interfaces, excluded_dashboards):
                 if_name = _interfaces[0].get('port')
                 router = _interfaces[0].get('equipment')
             router = router.replace('.geant.net', '')
-            title = f'{router} - {if_name} - {name} ({sid})'
+            title = f'{router} - {{}} - {if_name} - {name} ({sid})'
 
             if lag_service:
                 if len(_interfaces) > 1: