Use the new field .status in the search UI

The field .status can have the values:

```{rust}
            Self::Active => "Aktiv",
            Self::Obsolete => "Obsolet",
            Self::Planned => "Geplant",
            Self::UnderDevelopment => "In Entwicklung",
```

The search UI uses these as follows:

* In the search result page:
   Warn users about datasets that are obsolete
* In the details page:
    * Warn users about datasets that are obsolete
    * Inform users if a dataset is not active

This MR needs to run against metadaten!876 running on localhost with adapted "api-proxy.js"

See merge request !83