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It works like a charm.
You have to clear your browser cache and restart tomcat after copying ZmMsg_es.properties.
Anyway, your browser must be configure to select spanish as default language and not english.
Yes It works for the admin too!! When you upgrade to 4.0.2 you have to reinstall the translation again, restart tomcat and clean the browser buffer cache (firefox: ctrl+shift+r) and the admin translation is here
Msgs.zip by Pbruna (attached file in last post of Pbruna) have three files:
AjxMsg_es_ES.properties
ZmMsg_es_ES.properties: For user
ZaMsg_es_ES.properties: For admin
Yes, those provided in your link works, but are incomplete. They were designed for old zimbra versions. My devel team is working in a new full set of messages. If you want, send me your email address and I will attach them. We have only translated ZmMsg and AjxMsg. Help and Admin interface are not planned at this moment.
Bugzilla
Wiki
Source
zcs-4.0.2_GA Spanish Translation 
Yes, it works! 
My mistake.. 
Linear Mode
