Changing message "This e-mail address is already registered"

Using 2.0.4 on Joomla 3.3.6

I have been instructed to alter the message that pops up at the end of registration indicating that "This e-mail address is already registered"

I have gone thru the language files, the profiler.php, profiler.html.php and the js files but have struck out.

Anyone have an idea where I might be able to locate this text so that I can configure is as request?

Thanks

Mike