/usr/share/help-langpack/gl/gnome-sudoku/ is in language-pack-gnome-gl-base 1:16.04+20160415.
This file is owned by root:root, with mode 0o755.
..
/usr/share/help-langpack/gl/gnome-sudoku/basics.page
/usr/share/help-langpack/gl/gnome-sudoku/bug-filing.page
/usr/share/help-langpack/gl/gnome-sudoku/commandline.page
/usr/share/help-langpack/gl/gnome-sudoku/develop.page
/usr/share/help-langpack/gl/gnome-sudoku/documentation.page
/usr/share/help-langpack/gl/gnome-sudoku/highlighting.page
/usr/share/help-langpack/gl/gnome-sudoku/hints.page
/usr/share/help-langpack/gl/gnome-sudoku/index.page
/usr/share/help-langpack/gl/gnome-sudoku/keyboard-shortcuts.page
/usr/share/help-langpack/gl/gnome-sudoku/legal.xml
/usr/share/help-langpack/gl/gnome-sudoku/license.page
/usr/share/help-langpack/gl/gnome-sudoku/notes.page
/usr/share/help-langpack/gl/gnome-sudoku/print-blank-puzzles.page
/usr/share/help-langpack/gl/gnome-sudoku/print-inprogress-game.page
/usr/share/help-langpack/gl/gnome-sudoku/rules.page
/usr/share/help-langpack/gl/gnome-sudoku/save-resume.page
/usr/share/help-langpack/gl/gnome-sudoku/statistics.page
/usr/share/help-langpack/gl/gnome-sudoku/strategy.page
/usr/share/help-langpack/gl/gnome-sudoku/toolbar.page
/usr/share/help-langpack/gl/gnome-sudoku/trackers.page
/usr/share/help-langpack/gl/gnome-sudoku/translate.page