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Overview

Guccho uses Nuxt’s i18n module (@nuxtjs/i18n) to provide multilingual support. The i18n system is configured with a layered approach, allowing you to customize translations at different levels.

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Supported Languages

Guccho currently supports four languages out of the box:
  • en-GB (English - International) - Default locale
  • fr-FR (French - France)
  • de-DE (German - Germany)
  • zh-CN (Chinese - Simplified)
These are defined in src/def/index.ts: 
export enum Lang {
  enGB = 'en-GB',
  zhCN = 'zh-CN',
  frFR = 'fr-FR',
  deDE = 'de-DE',
}

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Configuration

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Locale Detection

The i18n module is configured in nuxt.config.ts with automatic locale detection: 
i18n: {
  strategy: 'no_prefix',
  defaultLocale: Lang.enGB,
  detectBrowserLanguage: {
    useCookie: true,
    cookieKey: Constant.CookieLangKey as string,
    redirectOn: 'root',
  },
  locales: [
    {
      code: Lang.enGB,
      flag: CountryCode.UnitedKingdom,
      name: 'English (International)',
    },
    {
      code: Lang.frFR,
      flag: CountryCode.France,
      name: 'French (France)',
    },
    {
      code: Lang.deDE,
      flag: CountryCode.Germany,
      name: 'Deutsch (Deutschland)',
    },
    {
      code: Lang.zhCN,
      flag: CountryCode.China,
      name: '简体中文 (中国)',
    },
  ],
}

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Message Layers

Translations are loaded in layers using i18n.config.ts: 
import ui from './guccho.ui.config'
import { locales as serverMessages } from '$active/locales'
import { Layer } from '~/common/utils'
import { Lang } from '~/def'
import clientMessages from '~/locales/base'
import { every } from '~/locales/utils'

const locales = new Layer(clientMessages)
  .add(serverMessages)

if (ui.legacyOption?.name) {
  locales.add(every({ server: { name: ui.legacyOption.name } }))
}
if (ui.i18n?.messages) {
  locales.add(ui.i18n.messages)
}

export default defineI18nConfig(() => {
  return {
    legacy: false,
    locale: Lang.enGB,
    fallbackLocale: Lang.enGB,
    messages: locales.flat(),
  }
})
The layer priority (from lowest to highest):
  1. Base client messages (~/locales/base) - Core translations
  2. Server messages ($active/locales) - Backend-specific translations
  3. Legacy server name - Simple server name override
  4. UI config messages - Custom translations from guccho.ui.config.ts

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Adding Custom Translations

Add custom translations in your guccho.ui.config.ts: 
import { Lang } from './src/def'

export default {
  // ... other config
  
  i18n: {
    messages: {
      [Lang.enGB]: {
        footer: {
          blog: 'Blog',
          nuxt: 'Nuxt',
        },
        server: {
          name: 'My Server',
        },
      },
      [Lang.frFR]: {
        footer: {
          blog: 'Blog',
          nuxt: 'Nuxt',
        },
        server: {
          name: 'Mon Serveur',
        },
      },
      [Lang.zhCN]: {
        footer: {
          blog: '博客',
          nuxt: 'Nuxt',
        },
        server: {
          name: '我的服务器',
        },
      },
    },
  },
}

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Method 2: Every Helper

For translations that are the same across all languages, use the every helper: 
import { every } from '~/locales/utils'

const commonTranslations = every({
  server: {
    name: 'Universal Server Name',
  },
})
This automatically creates the same translation for all supported languages.

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Translation Structure

Base translations are organized in src/locales/base/{locale}.ts. Here’s an example structure from en-GB.ts: 
export default {
  server: {
    name: 'Guccho',
  },
  
  footer: {
    about: 'About',
    resources: 'Resources',
  },
  
  mode: {
    [Mode.Osu]: 'Osu',
    [Mode.Taiko]: 'Taiko',
    [Mode.Fruits]: 'CTB',
    [Mode.Mania]: 'Mania',
  },
  
  title: {
    'leaderboard': 'Leaderboard',
    'status': 'Status',
    'settings': 'Settings',
  },
  
  global: {
    'logout': 'Sign out',
    'login': 'Sign in',
    'register': 'Sign up',
    'pp': 'pp',
  },
}

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Usage in Components

Access translations in your components using the $t function: 
<template>
  <div>
    <h1>{{ $t('server.name') }}</h1>
    <p>{{ $t('title.leaderboard') }}</p>
  </div>
</template>
Or in script: 
const { t } = useI18n()
const serverName = t('server.name')

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Locale Detector

Guccho includes a custom server-side locale detector at src/server/localeDetector.ts (experimental feature) that can detect the user’s preferred language based on browser settings and cookies.

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Best Practices

  1. Keep translations consistent - Use the same key structure across all locales
  2. Use nested objects - Organize translations by feature or component
  3. Leverage the layer system - Override only what you need in higher layers
  4. Test all languages - Ensure all supported languages have complete translations
  5. Use TypeScript - The type system helps catch missing translations

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Adding New Languages

To add support for a new language:
  1. Add the language code to the Lang enum in src/def/index.ts
  2. Create translation files in src/locales/base/{new-locale}.ts
  3. Add the locale configuration to nuxt.config.ts
  4. Update the every helper in src/locales/utils.ts to include the new locale
If you’re interested in helping translate Guccho into other languages, please contact the maintainers.