The operation in the dialog is the same as the procedure of Duplizieren groups of elements.
Procedure:
The elements to be changed are markiert. By clicking "Mass change" in the Menüband, the "Mass changes" tab is opened. The "Rename element" function is then selected.
Example: Rename element
By clicking on the "Set" button, a dialog opens which is familiar from the "Umbenennen" function.
After entering the desired changes, click the Execute button in order to rename the elements accordingly.