Alphanumeric Callsign For Flights (#1124)

* Alphanumeric Callsign For Flights

PR adds ability to define alphanumeric callsigns to flights, display them and use them during SimBrief OFP generation (if pilot ident as callsign option is not enabled)

Translations for en/es/it/pt-br added.

* Change db table name

* Change db column name, fix rules

* Change db column name

* Another db column name change

* Just another one more

* Last one from anumeric_callsign to callsign

Co-authored-by: Nabeel S <nabeelio@users.noreply.github.com>

resources/lang/it/flights.php

@@ -5,6 +5,7 @@ return [
     'flighttime'       => 'Tempo di Volo',
     'flighttype'       => 'Tipo di Volo',
     'flighthours'      => 'Ore di Volo',
+    'callsign'         => 'Nominativo',
     'route'            => 'Rotta',
     'mybid'            => 'Mie Prenotazioni',
     'addremovebid'     => 'Aggiungi/Rimuovi Prenotazione',