The foreign language is French(the language of love. Of course). Je veux ton amour = I want your love. Et je veux ta revanche = And I want your revenge. It's just a translation of the prior chorus lines. As for the meaning of this song, it's mainly about True Love. Throw in some adventure, romance, and hot s**. Kinda like Bonnie and Clyde. "I want your ugly. I want your disease. I want your everything." is her way of saying, I love everything about you. Which is True Love.