I have not changed it wherever unicode, is13194, iso639, cdac and akruti were involved, since they all use the old name. (I am not sure about cdac though, because I was not able to run their software)
There was also a typo in erc/erc-lang.el and lisp/ldefs-boot.el, iso639-1 was written as iso638, I fixed that.
Please review the patch.
Also please check if the commit message is correct.
Thank You.