En: You'll be graded on your effort which will affect whether you pass or fail the class.
Fr: Vous serez notés en fonction de votre investissement et cette note comptera pour la moyenne du troisième trimestre.
You will be graded according to your involvement and this grade will count in your average for the third trimester.
I think the difference here is mostly based on the way the school system works. In France, the students would be graded in each subject multiple times during a trimester, and at the end of each trimester, all the subject averages are put together to make the student's average grade (la moyenne). There isn't really such a thing as passing or failing a class in middle school.
Marinette calls Chloé a "peste" (lit. pest) in the French dub but not in the English one.
Jagged after Vincent told him he was his biggest fan
En: I know! You've been to my last 36 shows!
Fr: Je sais ! Vous êtes venu à mes 30 derniers concerts.
I know! You came to my last 30 concerts.
This is such a funny difference. I imagine the writers of the English dub sitting in a room being like uhm, I don't thing 30 shows is enough, let's add 6 more.
Chloé to Marinette
En: Failed as a gofer already? Not surprised. Don't let the door hit you on the way out!
Fr: T'as déjà raté ta première mission de chasseuse ? Ça m'étonne pas. Je l'ai toujours su, on peut pas compter sur toi !
You've already failed your first mission as a gofer? It doesn't surprise me. I've always known it, we can't rely on you!
The word used for gofer in French is "chasseur", which literally means hunter.
Pixelator after capturing Adrien and Chloé
En: Photo-finished!
Fr: C'est dans la boîte.
It's in the box.
Adrien
En: What in the-
Fr: Mais ?
But?
No (almost) swearing in the French dub!!
Marinette to Peggy
En: Just trying to do the job right the second time.
Fr: Mais je voulais être sûre que ça lui plaise cette fois ci.
But I wanted to be sure that he would like it this time.
Pixelator
En: See you later, alligator.
Fr: À plus tard, le sac à main.
See you later, hand-bag.
Sadly, the phrase "see you later, alligator" doesn't exist in French so we had to think of a different joke.
Pixelator
En: So you're Ladybug. I've heard such pathetic things about you.
Fr: Alors c'est toi Ladybug, toi tu peux être sûre que je ne serai jamais un de tes fans.
So you're Ladybug. You can be sure that I will never be one of your fans.
Jagged calls his grandma's weekly activity "bingo night" in English, but "soirée poker" (poker night) in French.
Nadja
En: Care for an interview with the reporter who spreads the villain's voice?
Fr: Pouvez vous répondre à quelques questions pour notre chaîne d'information ?
Can you reply to a few questions for our news channel?
Pixelator
En: All I want is one photo! Otherwise, soon, the people of Paris will be nothing but memories!
Fr: Je veux juste une petite photo. Sinon, bientôt, les Parisiens et les Parisiennes ne seront plus qu'un simple cliché !
I just want a small picture. Otherwise, soon, the Parisians will only be a simple "cliché"!
In French, the word "cliché" can both mean a picture taken by a camera and, well, a cliché.
Jagged when Pixelator is about to take a photo of him
En: Wait! Wrong side. This isn't my best angle. No, no wait. The lighting is all wrong! Does my nose look shorter this way? Oh, I know! This is better!
Fr: Attends ! Pas comme ça, c'est pas assez rock. Non attends ! Il est naze cet éclairage. Dommage que j'ai pas ma guitare. Je sais, comme ça c'est top.
Wait! Not like that, it's not rock enough. No wait! This lightning is knackered. It's a shame that I don't have my guitar. I know, like this, it's great.
