I think the correct layer to do this in is the session layer, rather
than by getting the user to explicitly choose a language.  This is
because (as I understand it) users do not need to pick a particular
language, but instead have a small set they use.

This could be accomplished by making new sessions /usr/share/xsessions
/gnome-en.desktop and /usr/share/xsessions/gnome-zh.desktop which are
copies of /usr/share/xsessions/gnome.desktop.  This would mean the user
could choose the session language from the session type combo box.

In /etc/X11/Xsession.d/99locale-session, you can check for the session and 
override the users locale settings, i.e.:
if [ $DESKTOP_SESSION = "gnome-en" ] ; then
    LANG=en_US.utf8
    DESKTOP_SESSION=gnome
elif [ $DESKTOP_SESSION = "gnome-zh" ] ; then
    LANG=zh_CN.utf8
    DESKTOP_SESSION=gnome
fi

(This is not tested and theoretical)

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https://bugs.launchpad.net/bugs/803858

Title:
  Unable to switch between Chinese and English in LightDM

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