[imp] sent-mail folder

[info at michis-homepage.net]

Hello together,

I am using Plesk 9 with Horde webmail and I have the problem, that  
Horde everytime an e-mail is sent, which was saved, a new folder  
?sent-mail? is created, instead of saving to the folder ?Sent?.
I found a switch in /imp/prefs.conf where you can set the folder name,  
but then if you write a new message the user sees the English word  
?Sent? in the sentence ?Save mail to xxxx? and not for example  
?Gesendete Nachrichten? (in German), because people from different  
countries use webmail.
Is there also a way to rename all the folders on the left to other  
languages instead of the system-language?
Thank you very much in advance.

Michael