You missed the point, brunx. My reaction was to the following bit of your previous message:
There are too many cases that display, foreign crew landing in LEMD with no least idea of speaking Spanish with controllers, and a long discussion between lot of Spanish pilots about that.
Are you implying I should know Spanish to operate into LEMD when on duty with my non-Spanish company? I better start learning now as I have a flight to Spain in two weeks!
Had I to work in Spain, of course I would do my best to learn Spanish for my daily life. That would be my fifth language...