update: wrap radio label in a span

For css matters we sometimes need to select the label text only.

I suggest to add it in a span.

use case example:

#test1 > div > label > input:checked + span {
  border: 1px solid green;
}

that is already done for checkbox: https://git.startinblox.com/framework/sib-core/blob/master/src/new-widgets/templates/formTemplatesDirectory.ts#L57

@Marjolaine need it