As stated in the title, what do employers typically expect, when they ask for experience in a certain programming language in an offering for a part time job directed at enrolled students? Especially for languages not taught at the local university?
They expect you to know and understand at least the basics so that you will be productive without having to be taught the language. As a part-time student position, they'll be looking for a small piece of work from you, and not have to train you.
You won't need to be a master level practitioner, and you won't need to know all the intricacies of various frameworks or libraries you may use with it, I'd expect them to be handing you somewhat simple tasks to complete that their main staff are too busy to complete, so you'd be expected to be able to write a new program rather than bugfix existing code, though obviously this is very much specific to the actual employer, but it shows you may well have to start from scratch to make something relatively simple.