Pontoon: Update Welsh (cy) localization of AMO
Pontoon: Update Welsh (cy) localization of AMO

Co-authored-by: dariushuws <2469954f89bec8e5a5f589fbe7fa833b9d37f62d@gmail.com>
Co-authored-by: Rhoslyn Prys <4b452082cb1ebbe08c62c0fd1b3c90f9b6f8b4b8@posteo.net>

mozilla/addons-server,diox/olympia,wagnerand/addons-server,wagnerand/addons-server,mozilla/olympia,bqbn/addons-server,diox/olympia,bqbn/addons-server,mozilla/addons-server,wagnerand/addons-server,bqbn/addons-server,diox/olympia,diox/olympia,bqbn/addons-server,wagnerand/addons-server,mozilla/addons-server,mozilla/olympia,mozilla/addons-server,mozilla/olympia,mozilla/olympia