If an additional Add-in, that integrates into the empower Ribbon-Menu, is installed, the empower Ribbon-Name is changed to "empower enterprise" and is no longer editable from the empower Customizing Menu.
In order to change the name nevertheless, you can deploy the following Registry-Key on all Client-PCs.
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Made in Office\empower\Core]
[HKEY_LOCAL_MACHINE\SOFTWARE\Made in Office\empower\Core]
"MyRibbonName" needs to be changed to the desired name.