This mod is alternate to Portal 2. GLaDOS is destroyed and spent about 100 years until Aperture old workers who had escaped from the Enrichment Center returned to the Aperture Laboratories after being cryogenically frozen for hundreds of years. They are hiding somewhere in Aperture Laboratories while they are controlling some personality cores that replaces them in the test chambers.
Thanks to Omnicoder.
why is it all in Spanish?
Maybe because he speaks Spanish as a first language? I mean that's really the only logical thing I can come up with.