For me, it depends on what question I'm answering, and where the media originates. Since we are a site based on English, I always try to provide the English title, whether or not that was the original language. If a work originated in a non-English title, unless it's become more known under that title, I give the original title, followed by the English one, e.g.
Enthiran aka Robot in the United States, is likely the film you're looking for".
If the querent indicates they read the work in another language, I'll generally provide that title first, even if it wasn't the original language, e.g.
"Based upon you reading it in Spanish, I suspect you read La esclava de Gor, aka Slave Girl of Gor, by John Norman."
Just for the sake of completeness, I tend to do the same thing for title changes, using the title most likely to match up against what the querent was looking for, and then providing the original title.