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Please update currencies in piwik/core/DataFiles/Currencies.php. Estonia and Latvia have Euros (). Kroons and Lats are not in use anymore. Also the URL mentioned in comments doesn't exists: http://www.iso.org/iso/currency_codes_list-1.html
You can find updated info in: http://en.wikipedia.org/wiki/List_of_circulating_currencies
In 5a74d8d: Fixes #4654 Updating currencies. Thanks for the suggestion!
Fixes #4654 Updating currencies. Thanks for the suggestion!