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