Jean-Claude Juncker, the President of the European Commission, a French-speaker from the little tax haven of Luxembourg, is bitter about Britain’s departure from the European Union. He has taken to giving public speeches to multi-national audiences in French rather than English and has declared that “English is losing its importance in Europe”. Yet the irony is that even with Britain leaving, the EU will continue to depend utterly on the English language because it is the only language that most of its nations have in common. If an Estonian wants to talk to a Portuguese or a Greek to a…