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