What does it mean "update" ?

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I'm getting ready to upgrade my vanilla forum from 2.0 to 2.6.1.
I'm reading the readme file for 2.6.1 and it says,
"Update ALL locales you have installed (in /locales
)."
What does that mean? Does it mean, now that I have uploaded the new version onto my server, I should copy the old folder from the backup I made of the /locales folder when I started the upgrade?
Thanks for your time and any clarification.
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https://docs.vanillaforums.com/developer/locales/