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

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

ollie314/kuma,a2sheppy/kuma,a2sheppy/kuma,ollie314/kuma,ollie314/kuma,safwanrahman/kuma,Elchi3/kuma,mozilla/kuma,mozilla/kuma,yfdyh000/kuma,jwhitlock/kuma,safwanrahman/kuma,escattone/kuma,SphinxKnight/kuma,jwhitlock/kuma,SphinxKnight/kuma,escattone/kuma,jwhitlock/kuma,yfdyh000/kuma,Elchi3/kuma,mozilla/kuma,SphinxKnight/kuma,yfdyh000/kuma,mozilla/kuma,SphinxKnight/kuma,SphinxKnight/kuma,a2sheppy/kuma,escattone/kuma,a2sheppy/kuma,safwanrahman/kuma,safwanrahman/kuma,jwhitlock/kuma,mozilla/kuma,ollie314/kuma,jwhitlock/kuma,yfdyh000/kuma,yfdyh000/kuma,safwanrahman/kuma,ollie314/kuma,Elchi3/kuma,Elchi3/kuma,ollie314/kuma,safwanrahman/kuma,a2sheppy/kuma,SphinxKnight/kuma,yfdyh000/kuma,Elchi3/kuma