This removes the `intl:app-locales-changed` event listener that was added in bug 1760825, as it's not longer required. Depends on D159017 Differential Revision: https://phabricator.services.mozilla.com/D159018
This removes the `intl:app-locales-changed` event listener that was added in bug 1760825, as it's not longer required. Depends on D159017 Differential Revision: https://phabricator.services.mozilla.com/D159018