Drop 'environment' parameter for PdfService
We previously used it to control the setlocale 'locale' parameter depending on the environment, but upon reading php documentation, we can pass a list of locales and the server will pick the one that suits it
Fixed wrong variable name in terminals and extensions edit twig
Extend session timeout to 15 minutes (900 seconds)
Allow proper sorting of Position values for forms where the field Position appears (AnalogExtensionType and DigitalExtensionType)
Prepare billing emails for production