During the quest Hard Answers (Return to Enthir), when talking to Enthir in The Frozen Hearth Cellar, he states:
"I undertstand (sic). Now let me take a good look at this ..."
The above appears only when subtitles are enabled (obviously).
Although the letter "t" is a lovely letter, I'm pretty sure adding an extra one in the word "understand" isn't really necessary.

Just lettin' ya know so you can put a fix on your TODO list to keep your awesomeness up.
Much Love,
Cindy xo
*Edit: And yes, I mispelled Dialogue in the title. It's on my todo list to fix

