שולחן ערוך אורח חיים · סימן קמ״ה

English

The Laws Of The Translators. Containing 3 S'ifim: In the days of the Sages of the Talmud, they practiced translating [the reading into Aramaic when publicly reading] in order that the people would understand. The Torah reader is not permitted to read for the translator more than one verse, and the translator is not permitted to translate until the verse is finished by the Torah reader. The Torah reader is not permitted to read another verse until the translator has finished the translation. The Torah reader is not permitted to raise their voice louder than the translator, nor the translator louder than the Torah reader. And the Torah reader is not permitted to assist the translator, so that [people] won't say that the translation is written in the Torah.

English

A minor may translate on behalf of an adult, but it is not respectful for an adult to translate on behalf of a minor.

English

Nowadays, our custom is to not translate [aloud from the Aramaic Targum during the public reading], for what use would it be since no one would understand it?