I've retranslated this message (and the others in this message group) into ancient greek after I saw how terrible the already existing translation was. However, when visiting the Wikimedia Commons page for a file, it still shows the old bad translation. (e.g. Ἐλεύθερος σοι εἴς instead of Έλεύθερος εἶ).
URL: https://translatewiki.net/wiki/MediaWiki:Wm-license-cc-free/grc
LocalisationUpdate is disabled on Wikimedia wikis, and has been for a while.
See T206694: Determine desired architecture to update localization strings for Wikimedia, T158360: RFC: Reevaluate LocalisationUpdate extension for WMF, T220481: Reenable l10update in production.
Your change landed in rEWMEf11c99d09321: Localisation updates from https://translatewiki.net., which didn't make it into 1.36.0-wmf.21. So it will be part of 1.36.0-wmf.22, and should be on all Wikimedia projects by the end of next week as per https://wikitech.wikimedia.org/wiki/Deployments