Pattern

• Component code imports useI18n and the section locale index.
• Locale lookup falls back in this order: current locale, en, zh-cn.
• Components use t('section.key') for scalar labels and messages.section for structured arrays such as tabs, terms, diagrams, and summary flows.
• Interpolated labels use braces, for example t('adderChain.bitButton', \{ bit \}).

Example:

import { useI18n } from '../../../composables/useI18n.js'
import { computerFundamentalsLocale } from '../../../locales/computer-fundamentals/index.js'

const { t, messages } = useI18n(computerFundamentalsLocale)