[pdfmod] spanish translation

[CaStarCo <castarco gmail com>]

Hey :) ,

i've updated the spanish translation. I attached a coment in the
spanish translation in http://l10n.gnome.org/module/pdfmod/ but i
don't know if that's the correct way or if i must open a bug in
bugzilla :p .

Bye :) .

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