Add common strings in Agent dvr config flow (#41279)

homeassistant/components/agent_dvr/config_flow.py

@@ -62,7 +62,7 @@ class AgentFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
 
                 return await self._create_entry(agent_client.name)
 
-            errors["base"] = "device_unavailable"
+            errors["base"] = "cannot_connect"
 
         data = {
             vol.Required(CONF_HOST): str,

homeassistant/components/agent_dvr/strings.json

@@ -15,7 +15,7 @@
     },
     "error": {
       "already_in_progress": "[%key:common::config_flow::abort::already_in_progress%]",
-      "device_unavailable": "Device is not available"
+      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]"
     }
   }
 }

tests/components/agent_dvr/test_config_flow.py

@@ -49,7 +49,7 @@ async def test_connection_error(hass: HomeAssistant, aioclient_mock) -> None:
         data={CONF_HOST: "example.local", CONF_PORT: 8090},
     )
 
-    assert result["errors"] == {"base": "device_unavailable"}
+    assert result["errors"] == {"base": "cannot_connect"}
     assert result["step_id"] == "user"
     assert result["type"] == data_entry_flow.RESULT_TYPE_FORM