ja.po: ch_ops_log_monitor.xml
Fixed Motoki-san comments
https://github.com/openstack-ja/openstack-manuals/pull/28
Added <code> tag to nova.conf file
Added <code> tag to /var/log
Update the original string

The original document is updated and it needs to be used to generate
the translated version of the document. It is better to update ja.po
to catch up the latest.

Note that "latest" here is HEAD revision of master branch
(commit efe410a887bce532962c689be451e9b6d5875693).

Sync with new operation-guide repository is the future work.
Address comments from Kato-san
Merge pull request #28 from openstack-ja/trans-ja/ch_ops_log_monitor.xml

ja.po: ch_ops_log_monitor.xml