- renamed PLGNTLS_class -> Plgntls
- changed method 'add_to_front()' to static method
- moved fetch script as inline script, so the plgntls file is single
- improved the way inline script and styles are added
- card date validation now uses direct card duration, not a parameter
- checker for both types of transfert valid and invalid
- mv checks for transfert and date expiration in specific functions
