Translation of specialize in German

Thanks a lot. Today and tomorrow are holidays in Switzerland, but I'll do it Tuesday first thing in the morning...please have a look at it and confirm. Where do you want me to place a reference?
I would not put the box on the front page, you have it in the menu. But, if you want to have links from within your main page, put regular links within the introduction text, directly to the Spanish page.
Some of the people had invited me for dinner and I joined them. I soon found out that they were eating at their apartment and were cooking by themselves. I found myself peeling raw potatoes.