[ICONS] Invalid icons.json: Invalid translation key 'Low', need to be [a-z0-9-_]+ and cannot start or end with a hyphen or underscore. for dictionary value @ data['entity']['sensor']['battery_level']['state']. Got {'Low': 'mdi:battery-low', 'Normal': 'mdi:battery-high', 'Not in use': 'mdi:battery-unknown'}