[guilbep]

Maybe it's because there's more than 1 million iPhones in France? (1 out of 6 persons, currently more than 60 percent of peoples around me own an iPhone). I'm not aware of any gift-giving holiday (and I'm french). The only reason I can come up with is that the internet/connected french community is very strong, hence knowledge such as "this app is awesome and free" can spread very fast.

I just looked at the user's review on the appstore, and the rating is very high. There's even 5 stars with comments like: When will the french version be available? (It was written in french. I did the translation)

There's no french interface and It doesn't seem to really bother users, it could be a plus though.