Get an i18n parser working on xfce1 that can handle the "tr!()" macro

gettext 0.24 can handle rust-format strings, but the build container only has 0.23.2, and xfce1 (where txcron runs on the main host) is older.

The xtr rust utility can parse them, but that will require a bit more work, both to get it on xfce1, and to find the right command line options to give it.