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

Localization authors:
- Ashikur Rahman <ashikurrahman068@gmail.com>
- S M Sarwar Nobin <smsarwar1996@gmail.com>

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