Yes! Right answer. 
The "Taxonomy <'Birds - Clements - World - 2004'> names replaced by Lang/Reg List <'French'>" was created when you made the changes to help you revert back. So,
1. Select that Language/Region List from the dropdown
2. Select your Clements 2004 tax list in the Taxonomy dropdown
3. Click the Set Common Names button.
That will put your names back.
Let me know if I can assist further.
Jeff |