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

Localization authors:
- Tanha Islam <pink.devil.tanha@hotmail.com>

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