po: remove language list from zanata configuration
po: remove language list from zanata configuration

The <locales> element in zanata.xml is no longer relevant as this info
is recorded server side.

Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt-sandbox,libvirt/libvirt-sandbox,libvirt/libvirt-sandbox