Dealing with foreign film titles on IMDb
"Meghe Dhaka Tara" is a noun phrase. It makes sense for an API looking for movies to not translate the phrase as that is not its purpose. I suspect, that at most it will have some basic spell checks in place (for instance "did you mean `Megh Dhaka Tara'") 

If "The Cloud-Capped Star" is indeed an english dub for the movie, then it suggests that the service provider has not linked movies to its translations.