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you can changing it by using joomla language overrides. please goto joomla backend > extentions > languages. click overrides button.
find that text, click the result item and put new text on it.
Dear Albertus,
Thank you but when search the content for example (joomla language overrides Your account has been approved and you may now login to the site at ) i cant find it by using joomla language overrides,