it may be automatically recognized in other EU countrie
Back when Poland was negotiating its entry into the EU the government specifically attempted to make sure that Polish nursing qualifications would _not_ be recognized - it was a way to try to keep nurses in Poland without actually improving their pay...
In recent years there have been attempts to create nursing programs in English but I don't know about the quality....
In this particular case, it should be noted that this looks like a private university, the quality of which varies wildly in Poland (and programs in English are never as good as programs in Polish)
And... unless you're familiar with the region Rzeszów is liable to not be an especially easy town to come to terms with - the southeast is traditionally the poorest part of the country and unless you know (or can quickly learn) Polish getting everyday tasks done is liable to be difficult.