/usr/share/lightning/extensions/langpack-pt-pt@lightning.debian.org/chrome.manifest is in lightning-l10n-pt-pt 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 pt-PT jar:chrome/pt-PT.jar!/locale/pt-PT/calendar/
locale lightning pt-PT jar:chrome/pt-PT.jar!/locale/pt-PT/lightning/
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