Duplicate Transposed should be renamed or merged with Duplicate

[KoBeWi]

Godot version

ff118d7

System information

W10

Issue description

I recently dug up this old issue: godotengine/godot-docs#3967. It started from a user confused about Duplicate Transposed option. Then it was labeled as documentation issue and transferred, and finally closed, because the option was supposedly removed.

Except it wasn't, see my last comment. It still exists in the Edit menu, with a default shortcut and fully functional. So the original issue still stands. But instead of documenting an obscure option, I think it should be renamed to be more intuitive. Maybe to something like "Duplicate To Another Track".

Or maybe it could be merged with duplicate, which should just place the keys on the current track by default or on the selected track if one is selected and usable? (the operation fails for non-matching types)

Steps to reproduce

1. Go to Animation tab
2. Open the Edit menu
3. Notice the Duplicate Transposed option
4. You are now automatically confused

Minimal reproduction project

No response