The dutch one should be goedeNdag (though noone uses it. I think it is used even less than goodday in (american) english) not even in formal situations. Goedemiddag en goedemorgen (in this case no "n" is needed in the middle) ARE in use, for good afternoon and goodmorning. (I guess pretty similar to english, good afternoon being slightly more formal than good morning)
It's Guten Tag in German, the capital is important. And Chinese, Japanese, Arabic and Russian are just wrong, why not spell them in their respective writing systems ?