/usr/share/gnome/help/shotwell/el/formats.page is in shotwell-common 0.22.0+git20160108.r1.f2fb1f7-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/gnome/help/shotwell/el/../../../help-langpack/shotwell/el/formats.page