ApplicationController: Use FastGettext.set_locale in set_gettext_locale method
ApplicationController: Use FastGettext.set_locale in set_gettext_locale method

FastGettext contains the method to process HTTP_ACCEPT_LANGUAGE
header attribute with regional language codes support.
(transferred from ManageIQ/manageiq@815c567cdd1bc67f48e38cf73e824872e61e3e64)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic