Ultimate Translate - does it work with marketplace?

I've installed ultimate translate, but I'm not sure I've don everything correctly. Every time I open it, I get this error message:

"Attention: You have made setting changes that affect the rewrite rules for all blogs. Click below to rebuild the rewrite rules for all sites."

I click rebuild, but I'm not sure it's doing anything.

I'd like to have my store, dontretail.com translated into different languages, as well as the buy now buttons from marketplace, but it doesn't work. Where can I get help?

THanks