This is the 7207th most frequent Russian word.
венгерский
Hungarian.
Here, 'венгерский' is an adjective describing the noun 'язык', meaning 'language', to specify its relation to Hungary.
Я изучаю венгерский язык.
I am learning the Hungarian language.
'Венгерский' functions as an adjective modifying 'гуляш', indicating the dish's origin as Hungarian.
Мы попробовали венгерский гуляш в ресторане.
We tried Hungarian goulash at the restaurant.
In this sentence, 'венгерском' is the prepositional form of the adjective, agreeing with 'языке', specifying that the movie was made in the Hungarian language.