The Greek that is typically translated as «boldness» in English is often translated in the Protestant Mandarin Chinese Union Version with an existing Chinese proverb: tǎnrán wújù (坦然无惧) or «calm and fearless.» (Source: Zetzsche)
In Makonde it is translated as «being strong in heart.» (Source: Pioneer Bible Translators, project-specific notes in Paratext)
See also the boldness we have in him.