/usr/share/lightning/extensions/langpack-es-es@lightning.debian.org/chrome.manifest is in lightning-l10n-es-es 1:52.8.0-1~deb8u1.
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-ES jar:chrome/es-ES.jar!/locale/es-ES/calendar/
locale lightning es-ES jar:chrome/es-ES.jar!/locale/es-ES/lightning/
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