lxc-debian: Force locales generation

Signed-off-by: Laurent Vallar <val@zbla.net>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
lxc-debian: Remove perl, use sed instead

Signed-off-by: Laurent Vallar <val@zbla.net>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>