WAI site user interface words [@es translation]

Hi all,

Please, find attached the yaml file corresponding to the UI words
translated into Spanish. I didn't announce the intention of translation but
I talked directly to Shawn.

Please, let me know if I can contribute with something else.

Best,

Martin

-- 
Martin Alvarez Espinar
W3C Spain Office Manager        tel.:+34 984390616
http://www.w3c.es/Personal/Martin   martin@w3.org <mlvarez@w3.org>