Add build job for Japanese Install Guide

We now have a 100% translated Japanese install guide good to go.
This patch adds a new install-guide build job for foreign languages,
done in a generic way so future foreign languages can be easily
added. It adds Japanese language build jobs, since this is the
first fully translated language.

In addition, the opportunity was taken to genericise the
openstack-operations-guide-ja build job so it can be used
for languages other than Japanese.

NB: this is a first time working with templated jobs and variables,
appreciate careful review ... especially don't want to break the
openstack-operations-guide-ja job as I just got that working again!

Change-Id: I8a1c6462e6a136e05d4313dbfc6dc600d8395b79
Remove link to puppet dashboard

Remove link to puppet dashboard since it is down currently.
Reinstate this link when dashboard is up again.

Also remove link to ci-puppetmaster.openstack.org/
in the navigation since it is not a clickable link.

Change-Id: I8db61b1a7b77c7625502acbdb3b7594f94e6530f
Merge "Add build job for Japanese Install Guide"
Merge "Remove link to puppet dashboard"