[IMP] Show warning if no currency
[IMP] RegForm: Show closed if no currency selected
[FIX] RegForm: Overlap arrival and departure dates
[FIX] RegForm: disabled sessions shown as options
[FIX] RegForm: Sessions fetching on dialog update
[FIX] RegForm: number field not showing price
[FIX] RegForm: Radio items disaabled at creation
[FIX] RegForm: radio fields can't be empty
[NEW] CSS style for checkbox with text
[IMP] RegForm: colspan of label & checkbox fields
[IMP] Angular: Added DatePicker validation effects
[FIX] Angular: DatePicker validation
[IMP] Angular: Added DatePicker initialization
[REF] RegForm: Removed old implementation