#70 Link
#70 Basic monthly report
#72 Change the link according to the user being logged or not
#71 Careful with BigDecimal.divide...
#70 Totals
#70 Navigation
#39 Includes `fullcalendar.js` for all pages
#39 Splitting JS between lessons & planning
#39 Initial set-up of the calendar field
#39 Formatting of the date on calendar selection
#39 Placeholder for the date
#39 Moved the format methods into the `application` singleton
#39 Date formatting before sending
#39 Lesson creation dialog moved from `planning.js` to `lessons.js`
#39 Time fields
#39 Correct formatting of hours on the `lesson` page
#39 Adjust the lesson dialog size
#39 Time validation
#39 Validation of time
#39 Validation of the range at server side