/usr/lib/python2.7/dist-packages/trytond/modules/project_plan/locale/de_DE.po is in tryton-modules-project-plan 3.0.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/trytond/modules/project_plan/locale/../../../../../../../share/pyshared/trytond/modules/project_plan/locale/de_DE.po