Use common strings in luftdaten config flow (#42376)

homeassistant/components/luftdaten/config_flow.py

@@ -69,7 +69,7 @@ class LuftDatenFlowHandler(config_entries.ConfigFlow):
         sensor_id = user_input[CONF_SENSOR_ID]
 
         if sensor_id in configured_sensors(self.hass):
-            return self._show_form({CONF_SENSOR_ID: "sensor_exists"})
+            return self._show_form({CONF_SENSOR_ID: "already_configured"})
 
         session = aiohttp_client.async_get_clientsession(self.hass)
         luftdaten = Luftdaten(user_input[CONF_SENSOR_ID], self.hass.loop, session)
@@ -77,7 +77,7 @@ class LuftDatenFlowHandler(config_entries.ConfigFlow):
             await luftdaten.get_data()
             valid = await luftdaten.validate_sensor()
         except LuftdatenConnectionError:
-            return self._show_form({CONF_SENSOR_ID: "communication_error"})
+            return self._show_form({CONF_SENSOR_ID: "cannot_connect"})
 
         if not valid:
             return self._show_form({CONF_SENSOR_ID: "invalid_sensor"})

homeassistant/components/luftdaten/strings.json

@@ -10,9 +10,9 @@
       }
     },
     "error": {
-      "sensor_exists": "Sensor already registered",
+      "already_configured": "[%key:common::config_flow::abort::already_configured_service%]",
       "invalid_sensor": "Sensor not available or invalid",
-      "communication_error": "Unable to communicate with the Luftdaten API"
+      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]"
     }
   }
 }

tests/components/luftdaten/test_config_flow.py

@@ -19,7 +19,7 @@ async def test_duplicate_error(hass):
     flow.hass = hass
 
     result = await flow.async_step_user(user_input=conf)
-    assert result["errors"] == {CONF_SENSOR_ID: "sensor_exists"}
+    assert result["errors"] == {CONF_SENSOR_ID: "already_configured"}
 
 
 async def test_communication_error(hass):