I found that two most popular plugins for multi language sites are WMPL and qTranslate. First one is commercial, so this is not option, and second doesn't have ability to translate widgets in sidebars, or I don't know how to do it. Can you suggest me which plugin to use or what trick to do to have multi language widgets?
I have used qTransalte a lot of times... i some cases i have used this kinda of code
Best of luck.