[core] Add the document copy action to the right click context menu in the left assist panel

This adds the "copy" action to the context menu for documents listed in the left assist panel.

desktop/core/src/desktop/js/ko/components/assist/ko.assistDocumentsPanel.js

@@ -42,10 +42,13 @@ const TEMPLATE = `
       'Show details'
     )}</a></li>
     <li><a href="javascript: void(0);" data-bind="click: open"><i class="fa fa-fw fa-edit"></i> ${I18n(
-      'Open document'
+      'Open'
+    )}</a></li>
+    <li><a href="javascript: void(0);" data-bind="click: function() { $data.selected(true); $data.parent.copy() }"><i class="fa fa-fw fa-files-o"></i> ${I18n(
+  'Copy'
     )}</a></li>
     <li><a href="javascript: void(0);" data-bind="click: function() { $data.selected(true); huePubSub.publish('doc.show.delete.modal', $data.parent); }"><i class="fa fa-fw fa-trash-o"></i> ${I18n(
-      'Delete document'
+      'Delete'
     )}</a></li>
     <!-- /ko -->
     <!-- ko if: $containerContext.sharingEnabled -->