ObieJazz,
the way I planned to combat that was to display next to the essay, the level of the person learning that language, so you could distinguish from practicing a language and contributing by writing in your native language.
That sounds like a good plan. Are people going to set their own level? And/or people could rate (or vote up) the essays and then a person would build karma in a particular language? Or maybe I'm just imagining that anything could benefit from being more like HN.