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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def title_translations(self, key, value):
 """Populate the ``title_translations`` key."""

    return {
        'language': langdetect.detect(value.get('a')),
        'source': value.get('9'),
        'subtitle': value.get('b'),
        'title': value.get('a'),
    }