Which major linguistic retail innovation did Amazon implement in 2015 that revolutionized cross-cultural shopping experiences?

Language and linguistics have dramatically transformed the retail landscape in recent years. From AI-powered translation services that enable global shopping to voice assistants that facilitate purchases through natural language processing. This trivia question focuses on an innovative linguistic retail strategy that changed how international brands connect with diverse customer bases.

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Automatic translation of product reviews across 8 languages, allowing shoppers to read feedback in their native language
Voice-activated shopping assistants trained in regional dialects and colloquialisms
Sentiment analysis software that adjusted product descriptions based on cultural linguistic preferences
Augmented reality interfaces that translated product information when viewed through smartphone cameras