How might one change language interface in Xfce?

You can change the language by generating a file ".i18n" in your HOME directory. Either use a text editor for this with the following content:

export LANGUAGE=en_US.utf8
export LANG=en_US.utf8
export LC_ALL=en_US.utf8

...or simply run this command in a terminal which generates the file as well:

echo "export LANGUAGE=en_US.utf8
export LANG=en_US.utf8
export LC_ALL=en_US.utf8" > $HOME/.i18n

Then logout and login.


Standard:

  1. sudo dpkg-reconfigure locales

Manually:

  1. sudo nano /etc/locale.gen (uncomment the one you want)
  2. sudo locale-gen
  3. sudo update-locale LC_ALL=en_US.UTF-8
  4. logout and login

Tested manual way with debian stretch / xfce.

The full documentation about changing locales in debian can be found in the debian Wiki.