- fixed an error on finance in admin panel

- flight ident now use this format: VA IATA(if empty ICAO) + Flight Number + - + Flight Code (without C) + - + Flight Leg (without L)
- added function __trans_choice in helpers.php for translation
- fixed error in flight edit/insert panel not showing/inserting Tuesday in days
- fixed an error occurring when metar retrieved is empty
- edited now-ui-kit.css to align login fields correctly
- added /public/assets/frontend/js/core/jquery-3.3.1.min.js to fix a missed resource error in authentication pages
- added translations file for en and it locales
- translated all the frontend templates

public/assets/frontend/css/now-ui-kit.css

@@ -2088,7 +2088,6 @@ fieldset[disabled]
 .form-group.form-group-no-border .input-group-addon,
 .input-group.form-group-no-border .input-group-addon {
   padding: 5px 0 5px 15px;
-}
 }
 
 .form-group .form-control,