Make exception messages translatable for APCUPSD (#143747)

Add translation domain and key for UpdateFailed in coordinator

homeassistant/components/apcupsd/coordinator.py

@@ -113,4 +113,7 @@ class APCUPSdCoordinator(DataUpdateCoordinator[APCUPSdData]):
                 data = await aioapcaccess.request_status(self._host, self._port)
                 return APCUPSdData(data)
             except (OSError, asyncio.IncompleteReadError) as error:
-                raise UpdateFailed(error) from error
+                raise UpdateFailed(
+                    translation_domain=DOMAIN,
+                    translation_key="cannot_connect",
+                ) from error

homeassistant/components/apcupsd/strings.json

@@ -219,5 +219,10 @@
         "name": "Transfer to battery"
       }
     }
+  },
+  "exceptions": {
+    "cannot_connect": {
+      "message": "Cannot connect to APC UPS Daemon."
+    }
   }
 }