Remove unnecessary quotes (and escapes) from Spanish translation.

Hi, I found a problem with the Spanish translation that looked very awful on the calendar, it was easy to fix so I corrected removing unnecessary quotes: from '\"x\"' to 'x'. Much nicer and clean. I made it in the branch version I'm using but I think it can be merged without problem.
I'm new in github so correct me if I did something wrong or that I shouldn't.

Thanks,
R.