/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/ is in gnome-shell-extension-multi-monitors 0.00~git20171014.1.df5d6e4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/de/
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/de/LC_MESSAGES/
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/de/LC_MESSAGES/multi-monitors-add-on.mo
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/de/LC_MESSAGES/multi-monitors-add-on.po
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/es/
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/es/LC_MESSAGES/
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/es/LC_MESSAGES/multi-monitors-add-on.mo
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/es/LC_MESSAGES/multi-monitors-add-on.po
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/fr/
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/fr/LC_MESSAGES/
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/fr/LC_MESSAGES/multi-monitors-add-on.mo
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/fr/LC_MESSAGES/multi-monitors-add-on.po
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/pl/
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/pl/LC_MESSAGES/
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/pl/LC_MESSAGES/multi-monitors-add-on.mo
/usr/share/gnome-shell/extensions/multi-monitors-add-on@spin83/locale/pl/LC_MESSAGES/multi-monitors-add-on.po