a recommended program for translating the "messages.properties" file?

[Olesya Gerasimenko]

Hello everyone!

I'd like to translate IcedTea into the Russian language. It would be 
great if someone could recommend a program for translating the 
"messages.properties" file. Lokalize doesn't support this format. I've 
tried uploading this file into Zanata, which didn't really work out (the 
sentences for translation are not showing, just some irrelevant segments 
are). If there is no such program, maybe there is one for converting 
this file to PO format?

Regards,
Olesya Gerasimenko