Comment 8 for bug 224882

Having lost good few hours searching where this setting could be, I am +1 to resolve this.

Minor, but ... somewhat important note. If you grep /etc/ for 'a4|letter', you will find /etc/papersize. No way you can guess that LANG="en_US.UTF-8" has anything with that....

At the very least (or until it is patched), my suggestion: in the default config, put on the top of the /etc/papersize the note like:

# Note that some applications use LANG/LC_PAPER settings instead of this configuration.
# To complete the paper size configuration, set in your /etc/environment (or .bashrc)
# LC_PAPER="en_US.UTF-8" for letter
# LC_PAPER="en_GB.UTF-8" for A4