If you chose to write your EE in a foreign language, be careful about how you categorize your EE and what you choose to discuss in it. I walked a thin line on my essay being disqualified because it didn't fit nicely into any one category, and this is even harder when writing in another language because you may have to restrict your category further by registering it as a foreign language EE, instead of as a normal EE that just happens to be in a foreign language. Look exhaustively for any resources concerning your specific predicament and please talk as much as possible with a foreign language teacher at your school for help in the language, because you will find it much harder and riskier writing the essay this way in comparison to the English-language writers' essays. If it starts to look like you might not complete it realistically, rewrite it in English and don't sweat it, you've already done a lot; it's hard. Saludos.