[i18n] Revised es_ES files

[Juan C. Blanco]

Hello, after seen some errors in the trslation messages fo S/MIME 
support I've made a few changes of the translation files for Spanish 
located at http://xweb.fi.upm.es/es_ES-20120416.zip

Regards
Juan C. Blanco
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| Juan C. Blanco                                                 |
|                                                                |
|  Centro de Calculo              |                              |
|  Facultad de Informatica U.P.M. |  E-mail: jcblanco at fi.upm.es  |
|  Campus de Montegancedo         |                              |
|  Boadilla del Monte             |  Tel.:    (+34) 91 336 7466  |
|  28660 MADRID (Spain)           |  Fax :    (+34) 91 336 6913  |
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