$ git config trailer.sign.key "Signed-off-by"
 $ cat msg.txt
 subject

-message
+Lorem ipsum dolor sit amet, consectetur adipiscing elit.

I am not sure this change is clarifying anything. If you want
something clearer for "internal body text inside the commit message",
you could perhaps just use "body" or "body text".

I am not against using such latin words, but then why only in the body
and not in the subject too? And if it's used in the subject too, then
I am not sure it will make it easy for users to understand that the
example is using a simple commit message.