Best practice for changing taxonomy.

There are certain terms that I'd like to change in Vanilla for my theme, but I'm not sure the best way to go about it.
For instance, Instead of the "New Discussion" button, I'd rather have it say "New Post".
I know that I could just duplicate the file where this text is found into my theme, but it seems a bit excessive to duplicate a whole file from the base just to change one word. Any chance there's a better way?
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Comments
You can do this with your own language file: http://vanillaforums.org/discussion/26597/tutorial-how-to-change-wording-how-to-change-text-how-to-change-language-how-to-change-locale
Awesome. Thanks @R_J