Some apps don't work anymore after you rename the .app folder, such as installer, customize, and so on. Here's how to rename them without them breaking.
1.SFTP into your iPot and navigate to /System/Library/CoreServices/Springboard.app/English.lproj(Or whatever language) and copy LocalizedApplicationNames.strings to your computer.
2. Go to
Convert Apple Property list from binary to text XML and convert the file into readable text.
3. Open the newly converted file and scroll down to the bottom.
4. Just before you see the following,
"</dict>
</plist>"
Add this:
<key>Application Identifier Here</key>
<string>What you want the app to be called here</string>
5. Transfer new file back to iPod.
6. Respring.
7. Enjoy results!
credits to hxc mainic