Pontoon: Update Sorbian, Upper (hsb) localization of AMO
Pontoon: Update Sorbian, Upper (hsb) localization of AMO

Localization authors:
- Michael Wolf <milupo@sorbzilla.de>

mozilla/addons-server,psiinon/addons-server,psiinon/addons-server,wagnerand/olympia,kumar303/olympia,kumar303/olympia,bqbn/addons-server,kumar303/addons-server,diox/olympia,kumar303/olympia,mozilla/olympia,aviarypl/mozilla-l10n-addons-server,mozilla/addons-server,wagnerand/addons-server,eviljeff/olympia,wagnerand/olympia,mozilla/olympia,diox/olympia,mozilla/addons-server,psiinon/addons-server,psiinon/addons-server,eviljeff/olympia,wagnerand/addons-server,wagnerand/olympia,mozilla/olympia,bqbn/addons-server,diox/olympia,diox/olympia,bqbn/addons-server,kumar303/addons-server,kumar303/addons-server,kumar303/addons-server,eviljeff/olympia,aviarypl/mozilla-l10n-addons-server,bqbn/addons-server,wagnerand/olympia,aviarypl/mozilla-l10n-addons-server,mozilla/addons-server,wagnerand/addons-server,wagnerand/addons-server,kumar303/olympia,aviarypl/mozilla-l10n-addons-server,eviljeff/olympia,mozilla/olympia