Strange we didnt caught this. I think this is because we use jquery rename function with im()... Guess we'll have to rename to some bogus word instead like xim_blabla or something. I'll see into this later today.
The "messages" text is part of the javascript and is stationary in the browser but somehow should be posible to overwrite using language define. It's one of these issues we put a little in the back as it was not the most important but we'll get to this also before release :)..
But nice spotted these two, thanks Mazarin