Tell me how multilingualism was implemented in the project (4 languages, Next.js)

In a Next.js project supporting 4 languages, multilingualism is usually implemented through Next.js's built-in i18n support or using libraries such as next-i18next.

Main points:

• In next.config.js, an array of supported locales is specified, for example: locales: ['en', 'ru', 'de', 'fr'].
• Next.js automatically handles routing with language prefixes (/en, /ru, etc.).
• Texts are stored in separate JSON files for each language, which are loaded on the server or client side.
• To switch languages, a component or function changes the current locale.

Example configuration:

module.exports = {
  i18n: {
    locales: ['en', 'ru', 'de', 'fr'],
    defaultLocale: 'en',
  },
}

This allows automatic handling of page and route localization, as well as optimizing the loading of necessary language resources.