Where are textproc/gtkspell dictionaries?

[Vlad "Blackflow" K.]

So Pidgin (net-im/pidgin) can apparently use textproc/gtkspell to provide
spell checking, and the knob is on by default, but the gtkspell package
does not carry any dictionaries and I assume that's the reason why there's
no spell checking support in Pidgin.

What provides these dictionaries?

Or maybe I'm asking the wrong question and should ask instead how to get
spell checking in Pidgin.