/usr/lib/libreoffice/program/resource/epsom.res is in libreoffice-l10n-om 1:3.5.2-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libreoffice/program/resource/epsen-US.res
/usr/lib/libreoffice/program/resource/epsen-US.res