/usr/lib/python2.7/dist-packages/zc/datetimewidget/resources/languages/calendar-ru.js is in python-zc.datetimewidget 0.7.0-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/zc/datetimewidget/resources/languages/../../../../../../../share/pyshared/zc/datetimewidget/resources/languages/calendar-ru.js