Add ServiceValidationError and translation support (#102592)

* Add ServiceValidationError

* Add translation support

* Extend translation support to HomeAssistantError

* Add translation support for ServiceNotFound exc

* Frontend translation & translation_key from caller

* Improve fallback message

* Set websocket_api as default translation_domain

* Add MQTT ServiceValidationError exception

* Follow up comments

* Revert removing gueard on translation_key

* Revert test changes to fix CI test

* Follow up comments

* Fix CI test

* Follow up

* Improve language

* Follow up comment

homeassistant/exceptions.py

@@ -12,6 +12,23 @@ if TYPE_CHECKING:
 class HomeAssistantError(Exception):
     """General Home Assistant exception occurred."""
 
+    def __init__(
+        self,
+        *args: object,
+        translation_domain: str | None = None,
+        translation_key: str | None = None,
+        translation_placeholders: dict[str, str] | None = None,
+    ) -> None:
+        """Initialize exception."""
+        super().__init__(*args)
+        self.translation_domain = translation_domain
+        self.translation_key = translation_key
+        self.translation_placeholders = translation_placeholders
+
+
+class ServiceValidationError(HomeAssistantError):
+    """A validation exception occurred when calling a service."""
+
 
 class InvalidEntityFormatError(HomeAssistantError):
     """When an invalid formatted entity is encountered."""
@@ -165,13 +182,19 @@ class ServiceNotFound(HomeAssistantError):
 
     def __init__(self, domain: str, service: str) -> None:
         """Initialize error."""
-        super().__init__(self, f"Service {domain}.{service} not found")
+        super().__init__(
+            self,
+            f"Service {domain}.{service} not found.",
+            translation_domain="homeassistant",
+            translation_key="service_not_found",
+            translation_placeholders={"domain": domain, "service": service},
+        )
         self.domain = domain
         self.service = service
 
     def __str__(self) -> str:
         """Return string representation."""
-        return f"Unable to find service {self.domain}.{self.service}"
+        return f"Service {self.domain}.{self.service} not found."
 
 
 class MaxLengthExceeded(HomeAssistantError):