[Openstack-i18n] Duplicated toctree of sidebar in translated install guides

Hi, I noticed translated install guides have a toctree in the sidebar twice. The example is http://docs.openstack.org/draft/ja/install-guide-obs/ . I filed a bug at https://bugs.launchpad.net/openstack-manuals/+bug/1516079 . It is due to the change in https://review.openstack.org/#/c/237885/ and I think it is because index.rst has two toctree. We are doing a special handling in tools/build-install-guides-rst.sh when generating a non-translated install guide. Do we need a similar handling for translated install guides? The translated install guides are currently generated by doc-tools-check-languages and some infra jobs. I am not confident how they are involved. Any help would be appreciated. Thanks, Akihiro