Dutch
Use 'required' and 'col_description' in one column in the demo types.
Column required: report the translated label when validation fails.

Note that the translation part currently does not work, but at least we get a nicer English name now.
Change ``Column.getLabel`` to support translation again.

You should pass a request as the context.
The 'required column' validator uses this to show a nice column name.
locales