updated japanese locale

* added compilemessages.py script
* ran makemessages
* ran compilemessages
* added a new japanese translation (thanks to Kazuhiro Hara)
re-ran makemessages again, this time after tx pull
updated locals, again (with tx push/pull)
Merge branch 'develop' into updated-japanese-locale
makemessages
tx push
tx pull
compilemessages
Merge branch 'updated-japanese-locale' into develop
Fixed PlaceholderAdmin to properly display plugin name.
Merge pull request #1666 from czpython/patch-4

Fixed PlaceholderAdmin to properly display plugin name.
Fixed Moving a plugin to a new placeholder ignores placeholder limits (#1646)
Merge branch 'develop' of github.com:divio/django-cms into issue-1646