I work in healthcare and worked at MGH. If you check their website and many big teaching hospital sites, Spanish, Chinese and Arabic are the three main languages it can be translated in due to the patient populations being the largest. I don’t disagree with the importance of Spanish, but the OP is absolutely on the right track with Arabic as well.
The refugee population, particularly in Boston is enormous and will only continue to grow.
To the OP, I applaud your work with refugees and the immigrant population, it’s one that is dear to my heart and that I’ve been part of as well. However, it’s a delicate line going from wanting to genuinely help and looking like a savior. Just be sure your essays don’t reflect a hero mentality of saving, but learning also. All the best!