Find attached a long overde update of the locale/es.po
file. This time I don't want to miss a Roundup release :)

The attached file is a complete replacement (122 KiB)
and not a diff (112 KiB).

It contains updates for all the new literals added
to roundup.pot since November 2006.

Also the word used to translate "file" has been changed
from "archivo" (as usually translated in Argentina)
to "fichero", a more Spanish as in Spain word but
understood on every spanish-speaking country. This allow
us to avoid ambiguities when translating sentences
containing both "file" and "archive".