The new multiselect does not respect the default value

[Piiit]

Example: https://webcomponents.opendatahub.testingmachine.eu/webcomponent/8282479b-dc13-5012-939f-7a0196348dca

Open the link. The language field is invalid, but the wcs-manifest.json says that the default should be "de"...
See https://github.com/noi-techpark/webcomp-tourism-skiareas/blob/8d94447adcdd63eeaf3822da176f3275a3245270/wcs-manifest.json#L54-L67 for details

In addition, the list below the multi-select is not necessary IMO. Please remove that too... thx

[Piiit]

@SirCotare This would be for you, can not assign you in this repo...