remove sensor state values from translation

[ChristophCaina]

The myskoda integration is using translation for sensor values, which are also translated by default within HomeAssistant.
Example: Device_Tracker -> "home" == "Anwesend" (de.json) or several Binary_sensors.

Therefore, the translation is in some areas not consistent with the translation provided by HomeAssistant itself for such values.

The Integration should only provide translated values, when HomeAssistant does not provide a valid / usefull translation for a sensor, whenever possible, the translation should use the default translation provided by HomeAssistant.

[WebSpider]

Feel free to submit a PR to improve this.

[WebSpider]

I've had a go at this when first starting with translations and have not found a good way (or example) to marry the core translations and custom integration translations successfully.

If someone has an example that works, or a PR that does this, that would be greatly appreciated.