loader animation for statistics display
onclick instead of mouseup for selecting articles and highlighting buttons
weekdays statistics now also shows hours, and lists public holidays as a separate day
removed statistics for hours since now included in weekday statistics; code formatting improvement;
updated translations
statistics for sold quantities are now sortable
don't show sales statistcs with count of zero; only consider public holidays within selected time window; print statistics bars
maximum width of items table on mobile devices 640px
updated changelog