Pontoon: Update Arabic (ar) localization of AMO
Pontoon: Update Arabic (ar) localization of AMO

Localization authors:
- Amer Hussam <Amer.h@msc-jo.com>

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