Sooner or later you'll face with javascript internationalization if you are developing a multilingual application. There is a wonderful i18n-js gem in Ruby on Rails for that. In spite of existing manuals, it took some time for me to figure out how it works.

Let's localize select2 messages from the example in the previous article.

  scope "/:locale", locale: /#{I18n.available_locales.join("|")}/ do
    resources :posts
    root to: redirect("/%{locale}/posts", status: 302)
  end
  root to: redirect("/#{I18n.default_locale}", status: 302), as: :redirected_root
  get "/*path", to: redirect("/#{I18n.default_locale}/%{path}", status: 302), constraints: {path: /(?!(#{I18n.available_locales.join("|")})/).*/}, format: false

Let's take a look at the above code sample from config/routes.rb and will study what it does line by line.