BUG-669: Use the local field, not the original one
BUG-669: Use the local field, not the original one

Since we want to display this using the local field (Text, though we
may want to think about using MarkdownWidget?) and not the original
one (XMLTree, whose old zeit.wysiwyg widget is definitely not usable
in AAD) it's probably best to declare the overridable field with the
matching local field -- even if it's just to we avoid breakage here
when the original is changed.

ZeitOnline/zeit.content.article,ZeitOnline/zeit.content.article,ZeitOnline/zeit.content.article