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Not sure that is possible and is recommended. The interfaces is devided into more then one area, Edit, Admin, Dashboard.. If you change to "Admin" what should you call the actuall admin interface?
i agree with Eric, I don't think that is recommended.
But if you really want to do it, you can do so with simple CSS.
For example:
#epi-quickNavigator .epi-quickNavigator-editLink a span { background: url("/static/img/Admin.png") bottom left no-repeat !important; }
/Mark
How to Change Text in the Episerver Admin dropdown from "EpiServer" to "Admin"