added spanish po file

I added a spanish translation for this project, let know to me if I'm missing anithing

Signed-off-by: Pablo Roberto Francisco Lezaeta Reyes [pˈaβ̞lo roβ̞ˈe̞ɾto fɾaɳθˈiʰko lˌe̞θaˈeta rˈejɛ] <prflr88gmail.com>