The irony is, I'm french, and I tried to "englishify" "en masse", thinking it made sense.
How many tons of people are leaving Facebook now?
As another example, if you translated tete a tete into "head to head", those actually have slightly different meanings in English. Tete a tete translates idiomatically to "one on one", a private meeting of the minds, while "head to head" is a direct--usually public--confrontation or encounter, as one might find in a sporting match.
Do I do it right ?
You could think of English as a contest between other languages, to see which one can get the biggest share of the etymology. French is one of the leaders. A lot of the core words come from Norman, but modern terms, particularly those drawn from cuisine and fashion, have made it in as well.
I found French class hard growing up. Until I realized that this "latin" language had as much in common with English as it did my two romanance language.