Author: Shamim Rezaie
MDL-69166 core_payment: display the gateways modal
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e9de4309071865bd7e7c2355097bdf8157bc02b6
http://github.com/moodle/moodle/commit/e9de4309071865bd7e7c2355097bdf8157bc02b6
+ 4.0 en [nogateway,payment]
+ 4.0 en [selectpaymenttype,payment]