Spanish Localization (ES) Issues

[damianmora]

Description for label subscribed is incorrect it says:

labels.inc:$labels['subscribed'] = 'Suscribipta';

but must be:

labels.inc:$labels['subscribed'] = 'Suscrita';

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Descriptions for labels fileuploaderror and filesizeerror are inconsistent with labels filename, filesize and addatachment, because there "files" are known as "archivos"(latam) and not "ficheros"(spain).

They say:

messages.inc:$messages['fileuploaderror'] = 'Fallo en la subida de ficheros';
messages.inc:$messages['filesizeerror'] = 'El fichero excede el tamaño maximo ($size)'

but should be:

messages.inc:$messages['fileuploaderror'] = 'Fallo en la subida de archivos';
messages.inc:$messages['filesizeerror'] = 'El archivo excede el tamaño maximo ($size)'