Add reconfig successful msg

homeassistant/components/google_generative_ai_conversation/strings.json

@@ -53,6 +53,9 @@
           }
         }
       },
+      "abort": {
+        "reconfigure_successful": "[%key:common::config_flow::abort::reconfigure_successful%]"
+      },
       "error": {
         "invalid_google_search_option": "Google Search can only be enabled if nothing is selected in the \"Control Home Assistant\" setting."
       }