[The Might]

I doubt that might help anyway, since I believe they have used the few words in Black Speech that are known to create a language they could use in the movies.
And another interesting thing I remembered.
Remember the scene in the movies where Sam falls from the rock near the Black Gate and Frodo comes to his rescue when they both hide underneath the Elvish cloak from 2 nasty Haradrim soldiers? I just remembered those 2 soldiers have some inscriptions on their helmets as well