The fields for " You have not answered any questions." (endcardInformationNoAnswers) and "You have to answer at least one question before you can submit your answers." (endcardInformationMustHaveAnswer) are translated in the submit screen.
in https://github.com/h5p/h5p-interactive-video/blob/master/src/scripts/interactive-video.js#L1119-L1129 should fix the problem.
IN FRENCH :
You have not answered any questions = Vous n'avez répondu à aucune question
You have to answer at least one question before you can submit your answers = Vous devez répondre à au moins une question avant de pouvoir soumettre vos réponses
Released as part of IV 1.19.4