Translate the following English sentence to French:
"However, it is difficult to predict what the content of this charter will be and how it will be implemented legally when you think of the people who are not currently citizens of the Union."
Il est cependant difficile de préjuger de son contenu et de sa mise en uvre juridique, si je pense aux gens qui ne sont pas citoyens de l'Union à l'heure actuelle.