Override Background Image Options Label

Hello,

how can i rename the "Background Image Options" labels?

I test this way, but it don´t work:

```
plugin.tx_bootstrap_package {
_LOCAL_LANG {
default {
option.background_image.parallax = Neu
option.background_image.parallax.description = Neu anzeigen
}
de {
option.background_image.parallax = Neu
option.background_image.parallax.description = Neu anzeigen
}
}
}
```

Thanks a lot for help