Hispanics are the "majority minority" and therefore it would be prudent for all nurses, I think, to know Spanish. Depending on immigrant patterns in your community, many other languages could be helpful. I worked somewhere where we had alot of Vietnamese and, even though we had some interpreters, there were a lot of dialects that baffled them.
My plan when my son gets older is to volunteer in the clinic that serves hispanics and force myself to speak Spanish even if it kills me. Most hispanics are eager to assist non-spanish-speaking learners.
In the meantime, when working through an interpreter, make eye contact with the person (the patient or the person speaking for the patient) that is speaking even if it seems weird. You may want to look at the interpreter but do this only when they are the only one speaking. Try to have MORE eye contact with the person being interpreted for and try to follow the conversation as much as possible. Appear interested and engaged. I had HS spanish and I can often understand some of what they say EVEN some nuance that the interpreter might not give you thanks to looking at their body language.
I always try to get in touch with what my feelings would be about receiving care by people who couldn't even speak my language. Think how scary that would be, much less that they wouldn't be culturally sensitive to health-illness norms for me.
My understanding is that MANY but obviously not all nursing programs
do not have language as a pre-req because they are time intensive to take and theyw ould displace other classes. Learning a language can be part of your life-long committment to being a learner.