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AstralRinth/.github/instructions/i18n-convert.instructions.md
Calum H. 042451bad6 feat: i18n switcher in app-frontend (#4990)
* feat: app i18n stuff

* feat: locale switching on load

* feat: db migration

* feat: polish + fade indicator impl onto TabbedModal

* fix: prepr checks

* fix: remove staging lock for language switching

* fix: lint
2025-12-29 19:41:39 +00:00

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---
applyTo: '**/*.vue'
---
You are given a Nuxt/Vue single-file component (.vue). Your task is to convert every hard-coded natural-language string in the <template> into our localization system using vue-i18n with utilities from `@modrinth/ui`.
Please follow these rules precisely:
1. Identify translatable strings
- Scan the <template> for all user-visible strings (inner text, alt attributes, placeholders, button labels, etc.). Do not extract dynamic expressions (like {{ user.name }}) or HTML tags. Only extract static human-readable text.
- There may be strings within the <script> block, e.g dropdown option labels, notifications etc.
2. Create message definitions
- In the <script setup> block, import `defineMessage` or `defineMessages` from `@modrinth/ui`.
- For each extracted string, define a message with a unique `id` (use a descriptive prefix based on the component path, e.g. `auth.welcome.long-title`) and a `defaultMessage` equal to the original English string.
Example:
const messages = defineMessages({
welcomeTitle: { id: 'auth.welcome.title', defaultMessage: 'Welcome' },
welcomeDescription: { id: 'auth.welcome.description', defaultMessage: 'You're now part of the community…' },
})
3. Handle variables and ICU formats
- Replace dynamic parts with ICU placeholders: "Hello, ${user.name}!" → `{name}` and defaultMessage: 'Hello, {name}!'
- For numbers/dates/times, use ICU options (e.g., currency): `{price, number, ::currency/USD}`
- For plurals/selects, use ICU: `'{count, plural, one {# message} other {# messages}}'`
4. Rich-text messages (links/markup)
- In `defaultMessage`, wrap link/markup ranges with tags, e.g.:
"By creating an account, you agree to our <terms-link>Terms</terms-link> and <privacy-link>Privacy Policy</privacy-link>."
- Render rich-text messages with `<IntlFormatted>` from `@modrinth/ui` using named slots:
<IntlFormatted :message-id="messages.tosLabel">
<template #terms-link="{ children }">
<NuxtLink to="/terms">
<component :is="() => children" />
</NuxtLink>
</template>
<template #privacy-link="{ children }">
<NuxtLink to="/privacy">
<component :is="() => children" />
</NuxtLink>
</template>
</IntlFormatted>
- For simple emphasis: `'Welcome to <strong>Modrinth</strong>!'` with a slot:
<template #strong="{ children }">
<strong><component :is="() => children" /></strong>
</template>
- For more complex child handling, use `normalizeChildren` from `@modrinth/ui`:
<template #bold="{ children }">
<strong><component :is="() => normalizeChildren(children)" /></strong>
</template>
5. Formatting in templates
- Import and use `useVIntl()` from `@modrinth/ui`; prefer `formatMessage` for simple strings:
`const { formatMessage } = useVIntl()`
`<button>{{ formatMessage(messages.welcomeTitle) }}</button>`
- Pass variables as a second argument:
`{{ formatMessage(messages.greeting, { name: user.name }) }}`
6. Naming conventions and id stability
- Make `id`s descriptive and stable (e.g., `error.generic.default.title`). Group related messages with `defineMessages`.
7. Avoid Vue/ICU delimiter collisions
- If an ICU placeholder would end right before `}}` in a Vue template, insert a space so it becomes `} }` to avoid parsing issues.
8. Update imports and remove literals
- Ensure imports from `@modrinth/ui` are present: `defineMessage`/`defineMessages`, `useVIntl`, `IntlFormatted`, and optionally `normalizeChildren`.
- Replace all hard-coded strings with `formatMessage(...)` or `<IntlFormatted>` and remove the literals.
9. Preserve functionality
- Do not change logic, layout, reactivity, or bindings—only refactor strings into i18n.
Use existing patterns from our codebase:
- Variables/plurals: see `apps/frontend/src/pages/frog.vue`
- Rich-text link tags: see `apps/frontend/src/pages/auth/welcome.vue` and `apps/frontend/src/error.vue`
When you finish, there should be no hard-coded English strings left in the template—everything comes from `formatMessage` or `<IntlFormatted>`.