Anybody worked on internationalization in ROR project?
If you are asking if Rails supports Unicode then the short answer is yes. There are some getting started guides available but the key point is that Rails extends Ruby's string class so that it doesn't destroy multi-byte characters, That's only the first step though, depending on the nature of your application and it's audience there is a fuzzy line between Internationalisation and localisation. My current Rails app correctly handles multi-byte languages but I wouldn't say that it is internationalised.
I've gone through the adaption of an existing C++ code base to unicode not an experience to be repeated - though I do feel stronger for it