translation support and table for castle covers

Hi mimilus, it´s great to see that one of my favorite mod will be improved. Thank´s for the new features and the promising textures in the tempo dir (I love these corner stones).
I made the translation some weeks ago and updated it to your version. Then I tighten the covers lua file, but if you don´t like I delete it from the request (as a noob, I don´t want to meddle in your work).