Pontoon: Update English (en-GB) localization of AMO
Pontoon: Update English (en-GB) localization of AMO

Localization authors:
- Firman <firmanwyd2000@gmail.com>
- Ian Neal <iann_bugzilla@blueyonder.co.uk>
- Kartik Patel <slokexx@gmail.com>

kumar303/addons-server,mozilla/addons-server,mozilla/addons-server,harry-7/addons-server,atiqueahmedziad/addons-server,tsl143/addons-server,atiqueahmedziad/addons-server,diox/olympia,kumar303/addons-server,diox/olympia,kumar303/olympia,atiqueahmedziad/addons-server,bqbn/addons-server,mozilla/addons-server,lavish205/olympia,psiinon/addons-server,mozilla/addons-server,diox/olympia,eviljeff/olympia,wagnerand/olympia,bqbn/addons-server,harikishen/addons-server,kumar303/olympia,harikishen/addons-server,aviarypl/mozilla-l10n-addons-server,harikishen/addons-server,kumar303/olympia,psiinon/addons-server,mozilla/olympia,bqbn/addons-server,kumar303/olympia,harry-7/addons-server,wagnerand/olympia,wagnerand/addons-server,eviljeff/olympia,aviarypl/mozilla-l10n-addons-server,lavish205/olympia,eviljeff/olympia,aviarypl/mozilla-l10n-addons-server,tsl143/addons-server,harry-7/addons-server,atiqueahmedziad/addons-server,mozilla/olympia,lavish205/olympia,wagnerand/addons-server,tsl143/addons-server,psiinon/addons-server,wagnerand/olympia,kumar303/addons-server,mozilla/olympia,wagnerand/addons-server,wagnerand/olympia,mozilla/olympia,wagnerand/addons-server,eviljeff/olympia,diox/olympia,harry-7/addons-server,bqbn/addons-server,psiinon/addons-server,tsl143/addons-server,kumar303/addons-server,aviarypl/mozilla-l10n-addons-server,harikishen/addons-server,lavish205/olympia