Use common strings in Ecobee config flow (#41257)

* Update common Strings

* one_instance_only -> single_instance_allowed

homeassistant/components/ecobee/config_flow.py

@@ -29,7 +29,7 @@ class EcobeeFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
         """Handle a flow initiated by the user."""
         if self._async_current_entries():
             # Config entry already exists, only one allowed.
-            return self.async_abort(reason="one_instance_only")
+            return self.async_abort(reason="single_instance_allowed")
 
         errors = {}
         stored_api_key = (

homeassistant/components/ecobee/strings.json

@@ -18,7 +18,7 @@
       "token_request_failed": "Error requesting tokens from ecobee; please try again."
     },
     "abort": {
-      "one_instance_only": "This integration currently supports only one ecobee instance."
+      "single_instance_allowed": "[%key:common::config_flow::abort::single_instance_allowed%]"
     }
   }
-}
+}

tests/components/ecobee/test_config_flow.py

@@ -26,7 +26,7 @@ async def test_abort_if_already_setup(hass):
     result = await flow.async_step_user()
 
     assert result["type"] == data_entry_flow.RESULT_TYPE_ABORT
-    assert result["reason"] == "one_instance_only"
+    assert result["reason"] == "single_instance_allowed"
 
 
 async def test_user_step_without_user_input(hass):