/usr/share/lightning/extensions/langpack-es-ar@lightning.debian.org/chrome.manifest is in lightning-l10n-es-ar 1:52.9.1-1~deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | locale calendar es-AR jar:chrome/es-AR.jar!/locale/es-AR/calendar/
locale lightning es-AR jar:chrome/es-AR.jar!/locale/es-AR/lightning/
|