Translate the following English sentence to French:
"At the same time, as the areas in which the European Union is becoming involved are expanding, the citizens are demanding, quite rightly, that it should be more democratic, more transparent and more efficient, and that it should be more diligent in respecting the principle of subsidiarity."
Parallèlement, et à mesure que s'étendent les domaines d'intervention de l'Union, les citoyens exigent, à bon droit, qu'elle soit plus démocratique, plus transparente, plus efficace et qu'elle respecte mieux le principe de subsidiarité.