add changenote

Author: petschki

news/+release_2_3_0.feature.md

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+Update mockup=5.4.0. See https://github.com/plone/mockup/releases/tag/5.4.0
+
+NOTE: This updates the selection button and popover.
+
+The selection button shows now the number of selected and maximum number of items within the current folder.
+The corresponding popover offers the option to select all items, all visible items on the page and to cancel the selection.
+The previous popover to manage the selected items is gone.
+There are also some minor fixes, e.g. one to prevent degrading the breadcrumb to show only ids, but rather keep the titles.
+The upper-left checkbox in the table for selecting all the items has now a tooltip.
+
+@pgrunewald, @petschki