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arXiv · 2509.22086

Multilingual Dialogue Generation and Localization with Dialogue Act Scripting

Justin Vasselli·Eunike Andriani Kardinata·Yusuke Sakai·Taro Watanabe
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Abstract

Non-English dialogue datasets are scarce, and models are often trained or evaluated on translations of English-language dialogues, an approach which can introduce artifacts that reduce their naturalness and cultural appropriateness. This work proposes Dialogue Act Script (DAS), a structured framework for encoding, localizing, and generating multilingual dialogues from abstract intent representations. Rather than translating dialogue utterances directly, DAS enables the generation of new dialogues in the target language that are culturally and contextually appropriate. By using structured dialogue act representations, DAS supports flexible localization across languages, mitigating translationese and enabling more fluent, naturalistic conversations. Human evaluations across Italian, German, and Chinese show that DAS-generated dialogues consistently outperform those produced by both machine and human translators on measures of cultural relevance, coherence, and situational appropriateness.

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Justin Vasselli, Eunike Andriani Kardinata, Yusuke Sakai, Taro Watanabe. 2025-09-26. Multilingual Dialogue Generation and Localization with Dialogue Act Scripting. https://arxiv.org/abs/2509.22086

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