Pontoon: Update Bengali (bn) localization of AMO Frontend
Pontoon: Update Bengali (bn) localization of AMO Frontend

Localization authors:
- Belayet Hossain <bellayet@gmail.com>

mozilla/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,kumar303/addons-frontend