ispell-change-dictionary

ispell-change-dictionary is an interactive autoloaded compiled Lisp function in `ispell.el'.

It is bound to <menu-bar> <tools> <spell> <ispell-change-dictionary>.

(ispell-change-dictionary DICT &optional ARG)

Change to dictionary DICT for Ispell.
With a prefix arg, set it "globally", for all buffers.
Without a prefix arg, set it "locally", just for this buffer.

By just answering RET you can find out what the current dictionary is.