Development of National Languages Act Article 11

Nationals may elect which national language they wish to use when involved in administrative, legislative, and judicial procedures of government agencies.Government agencies shall, when necessary, provide interpretation services in any/all national languages and shall cultivate interpreters in national languages.
中文原文 國家語言發展法第11條
國民參與政府機關(構)行政、立法及司法程序時,得使用其選擇之國家語言。
政府機關(構)應於必要時提供各國家語言間之通譯服務,並積極培育各國家語言通譯人才。

English translation for reference only; the Chinese text prevails. Not legal advice.