message: Add count for number of selected items in Organizer
diff: @@ -482,6 +482,7 @@ function ItemTable({
  </div>
  </div>
  <div className={clsx(styles.selection, styles.header)} role="columnheader" aria-sort="none">
  + <div>
  <input
  name="selectAll"
  title={t('Organizer.SelectAll')}
  @@ -494,6 +495,8 @@ function ItemTable({
  }
  onChange={selectAllItems}
  />
  + {selectedItemIds.length}
  + </div>
  </div>
  {filteredColumns.map((column: ColumnDefinition) => (
  <div
  