spanish translation updates

Peter,

Attached are pg_controldata, pgscripts and libpq spanish translations.
I will be asking for review from the rest of the spanish group so there
probably will be more updates as we get the style polished.

Please install. Thanks.

--
Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
"El que vive para el futuro es un iluso, y el que vive para el pasado,
un imb�cil" (Luis Adler, "Los tripulantes de la noche")