The license text.
This can be used to set a custom text for the license if it can't be set via [property@AboutDialog:license-type].
When set, [property@AboutDialog:license-type] will be set to [enum@Gtk.License.custom].
The license text will be displayed on the Legal page, below the copyright information.
License text can contain Pango markup and links.
[method@AboutDialog.add_legal_section] can be used to add license information for the application dependencies or other components.