Many aviation expressions originate from French: fuselage, longeron and aileron, for example.
Where confusion might arise, it makes sense to speak a common language. But otherwise there is no reason to demand that manuals are written in English (Airbus requires 'American', I understand) for users with other mother tongues.
Just to keep the frog-bashers happy, you'll be pleased to know that 'surrender' comes from the French verb
se rendre....
