My bad. https://launchpad.net/~mozillateam/+archive/ubuntu/ppa *does* have languages packs for Firefox ESR (see http://ppa.launchpad.net/mozillateam/ppa/ubuntu/pool/main/f/firefox-esr/).
My bad. https:/ /launchpad. net/~mozillatea m/+archive/ ubuntu/ ppa *does* have languages packs for Firefox ESR (see http:// ppa.launchpad. net/mozillateam /ppa/ubuntu/ pool/main/ f/firefox- esr/).