Harry Potter Fanfiction

Does anyone know if there is a site, or a project for the languages of the magical world?

Not English, French, German etc, but Parseltongue, Goblin, Mermish, Dragon, Dementor, Flobberworm -- the language of the races.

This is a part of a "get out of the same, repetitive stories" thing I've been trying. Instead of saying "The goblins said 'we want to take your account' in Gobbledegook" wouldn't it be more interesting to have them talk in it?

Part of this might be related to me being the child of a language-teacher and generally interested in how languages form.

But also -- creating a language? Doesn't it sound fun?