How can I modify the feedback message returned by joomla?
What method do I need to override in order to extend the functionality that renders this message?
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It's a simple language string which can be overriden in the language manager. For that go to the Language Manager and there the "Overrides" submenu. Click the "New" button. You can use the search to find the language key you need to override. However I usually just search the ini files in the language directory directly.
In your specific case, the only one I found which is matching is from Smart Search. So you're looking to override