Sorry man, I don't speak Spanish. I could use an AI translator, as I never got to learn Spanish, but implementing it would take me a lot of time, and also would open the project to more mistakes (which would also be harder to fix), also it probably won't sound natural.
I might be able to look into options with implementing something like google translate in game so that players can just click a button and all passages are translated, but I don't know how possible that is. HTML or not, the game engine I use has its limitations.