Set default locale for cloud Alexa config (#30749)

homeassistant/components/alexa/config.py

@@ -1,10 +1,12 @@
 """Config helpers for Alexa."""
+from abc import ABC, abstractmethod
+
 from homeassistant.core import callback
 
 from .state_report import async_enable_proactive_mode
 
 
-class AbstractConfig:
+class AbstractConfig(ABC):
     """Hold the configuration for Alexa."""
 
     _unsub_proactive_report = None
@@ -29,9 +31,9 @@ class AbstractConfig:
         return None
 
     @property
+    @abstractmethod
     def locale(self):
         """Return config locale."""
-        return None
 
     @property
     def entity_config(self):

homeassistant/components/cloud/alexa_config.py

@@ -78,6 +78,12 @@ class AlexaConfig(alexa_config.AbstractConfig):
 
         return self._endpoint
 
+    @property
+    def locale(self):
+        """Return config locale."""
+        # Not clear how to determine locale atm.
+        return "en-US"
+
     @property
     def entity_config(self):
         """Return entity config."""