Pontoon: Update Bulgarian (bg) localization of AMO
Pontoon: Update Bulgarian (bg) localization of AMO

Localization authors:
- :stoyan <stoyan@gmx.com>

psiinon/addons-server,kumar303/olympia,diox/olympia,diox/olympia,bqbn/addons-server,kumar303/olympia,psiinon/addons-server,bqbn/addons-server,eviljeff/olympia,bqbn/addons-server,kumar303/addons-server,mozilla/addons-server,mozilla/olympia,diox/olympia,mozilla/addons-server,wagnerand/addons-server,mozilla/olympia,kumar303/addons-server,wagnerand/addons-server,psiinon/addons-server,eviljeff/olympia,kumar303/addons-server,mozilla/olympia,kumar303/olympia,eviljeff/olympia,wagnerand/addons-server,mozilla/olympia,bqbn/addons-server,mozilla/addons-server,wagnerand/addons-server,diox/olympia,eviljeff/olympia,mozilla/addons-server,kumar303/olympia,kumar303/addons-server,psiinon/addons-server