In the event creation popover, show tips on allowed syntax instead of the cell's date
When clicking a cell, a popover shows up with
- A label that says "New event on $CELL_DATE"
- An empty GtkEntry text field
- The calendar chooser combobox
- Some buttons
#1 is pointless. Instead, show a label with helpful tips/reminders for users to use the syntax, especially once bug #700673's feature request is implemented, it could be something like, 'Enter an event title below. Times and places will be detected automatically, ex: "12h30 lunch with Warren Buffet at Tim Horton's" '