Use references in blebox config flow (#41244)

homeassistant/components/blebox/strings.json

@@ -1,13 +1,13 @@
 {
   "config": {
     "abort": {
-      "already_configured": "This BleBox device is already configured.",
+      "already_configured": "[%key:common::config_flow::abort::already_configured_device%]",
       "address_already_configured": "A BleBox device is already configured at {address}."
     },
     "error": {
-      "cannot_connect": "Unable to connect to the BleBox device. (Check the logs for errors.)",
+      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
       "unsupported_version": "BleBox device has outdated firmware. Please upgrade it first.",
-      "unknown": "Unknown error while connecting to the BleBox device. (Check the logs for errors.)"
+      "unknown": "[%key:common::config_flow::error::unknown%]"
     },
     "flow_title": "BleBox device: {name} ({host})",
     "step": {