Translate number selector unit for utility_meter (home-assistant#148276)

Author: karwosts

homeassistant/components/utility_meter/config_flow.py

@@ -94,6 +94,7 @@ async def _validate_config(
                 max=28,
                 mode=selector.NumberSelectorMode.BOX,
                 unit_of_measurement="days",
+                translation_key=CONF_METER_OFFSET,
             ),
         ),
         vol.Required(CONF_TARIFFS, default=[]): selector.SelectSelector(

homeassistant/components/utility_meter/strings.json

@@ -58,6 +58,11 @@
         "quarterly": "Quarterly",
         "yearly": "Yearly"
       }
+    },
+    "offset": {
+      "unit_of_measurement": {
+        "days": "days"
+      }
     }
   },
   "services": {