Fix invalid variable in localization
Fix invalid variable in localization

Originally added in https://github.com/mozilla/addons-frontend/commit/92ceeb59818f82bfc20ff8a1b07989cffd76f9a3

kumar303/addons-frontend,tsl143/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,mozilla/addons-frontend,mozilla/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,aviarypl/mozilla-l10n-addons-frontend,kumar303/addons-frontend,tsl143/addons-frontend,tsl143/addons-frontend,kumar303/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,tsl143/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend