You cannot edit IKE ROM over the ibus.

Possibly you have to remove IKE, remove ROM / EPROM / Flash memory from IKE, dump memory contents with EPROM reader, and then analyse, then reload.

Not a job for the faint hearted.

And if your goal is translating the languages into another language, remember that the LKM also sends messages to the CheckControl display. So you will have to edit the ROM in the LKM as well.

I know a guy who tried to do this, and some of the language strings in the LKM or IKE were encrypted, he was trying to figure out the encryption method. I don't know if he ever succeeded.