My question is in the title :)
Extension talk:ShowRealUsernames/Archive 2
Extension:Realnames may be what you are looking for, and it has just been updated to work with 1.31.1 LTS. (disclaimer: I am its author)
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Previous discussion was archived at Extension talk:ShowRealUsernames/Archive 1 on 2018-09-29.
Extension:Realnames may be what you are looking for, and it has just been updated to work with 1.31.1 LTS. (disclaimer: I am its author)