Improve discovery title (#27664)

homeassistant/components/deconz/.translations/en.json

@@ -11,6 +11,7 @@
         "error": {
             "no_key": "Couldn't get an API key"
         },
+        "flow_title": "deCONZ Zigbee gateway ({host})",
         "step": {
             "hassio_confirm": {
                 "data": {

homeassistant/components/deconz/config_flow.py

@@ -189,6 +189,7 @@ class DeconzFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
 
         # pylint: disable=no-member # https://github.com/PyCQA/pylint/issues/3167
         self.context[CONF_BRIDGEID] = bridgeid
+        self.context["title_placeholders"] = {"host": discovery_info[CONF_HOST]}
 
         self.deconz_config = {
             CONF_HOST: discovery_info[CONF_HOST],

homeassistant/components/deconz/strings.json

 {
     "config": {
         "title": "deCONZ Zigbee gateway",
+        "flow_title": "deCONZ Zigbee gateway ({host})",
         "step": {
             "init": {
                 "title": "Define deCONZ gateway",