Pontoon: Update Vietnamese (vi) localization of AMO
Pontoon: Update Vietnamese (vi) localization of AMO

Co-authored-by: Quế Tùng <8d73b2e17c5d12944b4c5ae79226d0b18e19b972@gmail.com>
Co-authored-by: nguye2lo <86e1811bf2120e62c1a271e6b4569ec9df6942c3@mail.uc.edu>
Co-authored-by: tn0562260 <39e262c6804b84e1b644e6295fb5b8ae49cc62de@gmail.com>

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