Hai =D
But D: I saw an example in the japanese-online.com which had "Nihongo de, (...)" and it translated 'Nihongo de' as "in japanese". I don't know if the sentence after 'nihongo de,' had any influence but if you count the comma as a sentence separator, you had an isolated "Nihongo de".
I'm not saying that you're wrong, I just don't understand when you can use 'de' now