Tell the language of the movie "C'era una volta il West".
language refers to language_name; movie "C'era una volta il West" refers to title = 'C''era una volta il West'
SELECT T3.language_name FROM movie AS T1 INNER JOIN movie_languages AS T2 ON T1.movie_id = T2.movie_id INNER JOIN language AS T3 ON T2.language_id = T3.language_id WHERE T1.title LIKE 'C%era una volta il West'