In my experience the TSO's will just speak slower and louder to the point of one word per 2 seconds at a shouting volume. This is done because everyone knows that everybody in the world understands English if it's spoken loud and slow.

...then if all else fails they'll just get an LEO and then point at the "suspect" with a frown while the LEO asks, "What do you want me to do about it? Call airport administration, they have translators."

...yes true story: IAD