So, in the original discussion about the pace for this book, I said that the language didn’t seem that difficult. I take that back 
Dude needs to learn that periods are a thing.
I agree, that description of the cherry tree beach is beautiful! But weirdly, the “自分は受験勉強もろくにしなかったのに、どうやら無事に入学できました” part is completely missing from Keen’s translation.
Of course the French version has lots more translation errors. I know it’s easy to criticize a 60 year old translation, buuuut it’s fun and the translator’s been dead for over 50 years so he won’t mind. The thing I find very weird is that he gets some pretty complex parts right, but sometimes makes really basic mistakes. Like translating 「自分には、人間の女性のほうが、男性よりもさらに数倍難解でした。」as “The male nature was much more difficult for me to understand than the female nature”. It’s the opposite. Seriously, より~のほうが is N5 grammar.
I’m not gonna list them all but another example is 「自分は、あの雷の如き蛮声を張り上げる配属将校をさえ(…)」It seems pretty obvious that あの雷の如き蛮声を張り上げる modifies 配属将校, but he translated it as “When I unleashed a savage, thunderous roar, the school officer…”
Oh and last week he didn’t know that お巡りさん means police officer and translated it as “people around me”.
A bit less obvious but he missed that 大庭 is the protagonist’s last name (I have to say I wasn’t sure and had to check the internet). So he translated このクラスは大庭さえいないと as “when the students are not in the courtyard”.
I could go on. I’m a bit sad and ashamed that this is the only French translation available and that it’s so poor quality 