Tongue-in-cheek of course, but I would argue that every mathematical, science, and technology course has its roots in Latin or Greek with English being the current working language!
Here in Canada an airline is regulated to play both English and French. There are some airlines, like Air Canada, which give equal service through their on-screen presentations. Then there are some other airlines which give lip service to French (predominately west of Ontario) and then there are those which give lip service to English (typically Quebec). By the sounds of things, other countries do the same.
I've not travelled internationally with Air Canada, but flying KLM and Martinair from YYZ I've sat through English, French, Dutch, and German. Air New Zealand from memory was English only out of AKL, YVR, LAX, SFO, and HNL. United has only ever been English the times I've been on.
I guess at the end of the day, that's why the Safety Features Cards are all diagrams - if you don't understand the language you'll certainly understand a circle with a line through it.