Question: when did hebrew become the official language of israel
[{'answer': '1948', 'provenance': [{'wikipedia_id': '6744873', 'title': 'Revival of the Hebrew language', 'start_paragraph_id': 1, 'start_character': 1057, 'end_paragraph_id': 1, 'end_character': 1061, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6744873', 'title': 'Revival of the Hebrew language', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1061, 'bleu_score': 0.604986515675452, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7251151220998171043}, 'section': 'Section::::Abstract.'}]}]