In the language list, Estonian appears to be labelled as "Inglese (US)", which is Estonian for "English (US)".
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migrated
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kumasasa
This ticket is a language translation request and is not supported on this bug tracker.
Please use the Crowdin Minecraft Translation Project for all translation change or add requests.
migrated
It's already sorted on Crowdin, so it's just a matter of waiting for the next time that it's pulled from there into the game's files. That will probably be when 1.9 comes out.