I'll be defending my Ph.D. this October. I submitted my dissertation in English and prepared an English presentation, but my supervisor along with the jury members surprised me by saying the defense speech cannot be in English and must be in French (“since we are from a country that has the second language is French”). Actually, they don’t mind an English report. In fact, they are very proud of the report.
So my question is, what would be suitable in this situation, keep the presentation in English and talk in French, or, I will change the presentation to French since I talk in French?