á á 
Á Á 
é é 
É É 
í í 
Í Í 
ó ó  
Ó Ó 
ú ú 
Ú Ú  
ñ ñ 
Ñ Ñ 
¿ ¿

Added 1 day later:

put it all together when finished...

Added 15 hours later:

do not believe that translate file missing countries ¿?
I will continue with the modules and plugins

• Please use the pastebin to paste big pieces of code.
• Use '&lt;' and '&gt;' instead of '<' and '>' in language strings - for HTML validation.

translations almost complete lack of countries file

DOWNLOAD TRANSLATIONS entire folder Language/Spanish - lang/es

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lang/es/main.es.lang.php

DOWNLOAD ARCHIVE main.es.lang.php

http://www.cotonti.com/pastebin/180

lang/es/message.es.lang.php

DOWNLOAD ARCHIVE message.es.lang.php

http://www.cotonti.com/pastebin/179

lang/es/users.es.lang.php

DOWNLOAD ARCHIVE users.es.lang.php

http://www.cotonti.com/pastebin/181

lang/es/admin.es.lang.php

DOWNLOAD ARCHIVE admin.es.lang.php

http://www.cotonti.com/pastebin/183

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Demonstration online
Admin: admin
Pass: admin

DEMO COTONTI SIENA SPANISH