Further ensures that locale is set
Further ensures that locale is set

This commit ensures that when checking if `LANG=` is set in
`/etc/default/locale` that:

1. stdout and stderr are silenced, and
2. `LANG=` is not commented out (something that could reasonably
   happen in future releases for documentation)

Thank you @dnschneid for the suggestions.

dnschneid/crouton,dnschneid/crouton,dnschneid/crouton,dnschneid/crouton,dnschneid/crouton,dnschneid/crouton