/usr/lib/libreoffice/share/gallery/diagrams.str is in libreoffice-common 1:4.2.3~rc3-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Translated by desktop-translate and ulfex
name = "see extras/source/gallery/share/gallery_names.ulf"
name[en]=Diagrams
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