In English we have quite a few French phrases which are commonly used in everyday speaking and writing.
I'm not referring to loan words, which originate in French but have now been adopted into English. I'm referring to French phrases, which are clearly recognized as French and which ares still considered foreign phrases, but which are frequently used in English.
There are a lot of examples here:
http://www.phrases.org.uk/meanings/french-phr...As I look through the list, I think that about 80-90% of these phrases would be recognized and used by any educated English speaker, not only those who have actually studied the French language. There are a few on the lsit that I would put in the loan word category (in other words, they have been adopted into English - such as sangfroid), and another few that are unfamiliar, at least in the US. But most of them really are in common use, at least among educated speakers.
What about German? Are French phrases often used in German?