I am slowly creating a Language of the Green.
The other language are Scots and Gaelic spoken during festival time, in Scotland and not in festival time too. Just a few words like a scintillating spice,, when it feels apropos, to weave them into the story is what I am thinking now.
Most of the characters are from Scotland. Though I don’t think any of them were born in Edinburgh. I will have to think and muse on this farther.