When working on !15 it was noticed that setting the gettext text domain via the `TEXTDOMAIN` environment variable does not work. At least the following scripts are offenders: * `config/chroot_local-includes/usr/local/bin/electrum` * `config/chroot_local-includes/usr/local/bin/tails-upgrade-frontend-wrapper` For an example of how it can be fixed, see 88918f95fed19d0458d875510b7da40330299a35.