Hi, how can I translate the mod into Spanish? I would like to help if someone tells me that cfg I have to change

Sure. If u want translate it, open the mod with any zip viewer, WinRAR, 7-Zip blabla... go in
Krastorio_X.X.X/locale/en/en.cfg and translate the strings on the right of each equal(=) in the file and post it or send it to me on discord, after appropriate checks that is not a joke ;) I will add it to the mod. Remember to not add spaces at the begin of the strings, the game will load all starting from the equal(=)

Anyway, I have update the cfg for the next version, if u want translate the latest file write me in discord