IOS7 - Reset self defined text labels?

hi there, is there any feature in IOS7 to reset all self defined text labels to improve access of e.g. bad labeled buttons to their native status? The reason I got that question is that it had happened to me yesterday that I had labeled the IoS7 standard app „Music“ to „iTunes Player“, just for trial purpose. After that, I wanted to reset this to „Music“ again but that’s not possible at all. You may open the known rename dialogue and than enter what ever you like, the system denies any further access to the label you’ve renamed once. Even a complete setup of my iPhone 5S without using any backup didn’t solve that problem. Martin