The subtitle is present in the Ukrainian original: "Хор лісових дзвіночків (уривок із поеми)" ["Chorus of forest bells (excerpt from a poem)"]. So it definitely was not added by the translator, and seems indeed to be the original title of the work.
The subtitle is present in the Ukrainian original: "Хор лісових дзвіночків (уривок із поеми)" ["Chorus of forest bells (excerpt from a poem)"]. So it definitely was not added by the translator, and seems indeed to be the original title of the work.