Update strings.json (#41051)

homeassistant/components/cert_expiry/strings.json

@@ -17,8 +17,8 @@
       "connection_refused": "Connection refused when connecting to host"
     },
     "abort": {
-      "already_configured": "This host and port combination is already configured",
+      "already_configured": "[%key:common::config_flow::abort::already_configured_service%]",
       "import_failed": "Import from config failed"
     }
   }
-}
+}