/usr/share/gnome-applets/ui/trashapplet-menu.xml is in gnome-applets-data 3.18.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | <section>
<item>
<attribute name="label" translatable="yes">_Open Trash</attribute>
<attribute name="action">trash.open</attribute>
</item>
<item>
<attribute name="label" translatable="yes">_Empty Trash</attribute>
<attribute name="action">trash.empty</attribute>
</item>
</section>
<section>
<item>
<attribute name="label" translatable="yes">_Help</attribute>
<attribute name="action">trash.help</attribute>
</item>
<item>
<attribute name="label" translatable="yes">_About</attribute>
<attribute name="action">trash.about</attribute>
</item>
</section>
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