Question: when did french become the official language of quebec
[{'answer': '1977', 'provenance': [{'wikipedia_id': '357629', 'title': 'Charter of the French Language', 'start_paragraph_id': 1, 'start_character': 84, 'end_paragraph_id': 1, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '357629', 'title': 'Charter of the French Language', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 312, 'bleu_score': 0.7165388826697221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3692460891827149062}, 'section': 'Section::::Abstract.'}]}]