PK2 edit of TrSro

Hello everybody,
can anyone explain me please how to edit PK2 files to patch TrSro into english?
I know there is already one version, but since I don’t know what’s in this file, I want to learn it by myself.

I found some guides, but they are all from 2007-2009

I would be happy about every helping suggest.

Thanks ENG Media.pk2