Flix, I did what you said, I copied those three archives to the folder and it worked! All is in english now except some minor things but the important stuff that you modded is all in english, skills, descriptions, items... It is exactly what I wanted. Thank you.
I must say that you explained things really well, I didn´t have any problem with the whole process to install the mod. You should explain this to others so those who aren´t english but doesn´t have problems with it can try your mod until you support more languages.
Thanks and keep up the good work!