The Vatican has no problems. It has invented much new Latin vocabulary to cope with science. Contrary to the myths propagated since the so-called "Age of Enlightenment", much of science came from within the Catholic Church and was written about in Latin.I find it a bit absurd that you think languages get less efficient over time. Try to translate a scientific text into Classical Latin, using actual Latin words the Romans would have understood. It will be a lot longer (less "efficient") than the French version.