[i18n] Spanish translations

[mperaya at alcazaba.unex.es]

Hello, We have notice that is there strings untraslated to spanish in horde and
related apps (later stable version of all of them)

Here you have the translated ones that we have translated for the imp
installation of my work. Also is there a little bug in the api.php file of Imp.
Here you have the diff from the original and the corrected one that works on mi
server.

IMP api.php i18 bug:
http://alcazaba.unex.es/~mperaya/imp-api.php-diff.txt

es_ES PO files:
http://alcazaba.unex.es/~mperaya/horde_es_ES.po
http://alcazaba.unex.es/~mperaya/imp_es_ES.po
http://alcazaba.unex.es/~mperaya/kronolith_es_ES.po
http://alcazaba.unex.es/~mperaya/mnemo_es_ES.po
http://alcazaba.unex.es/~mperaya/nag_es_ES.po
http://alcazaba.unex.es/~mperaya/turba_es_ES.po