Play Internationalization

class MySupportController @Inject()(component: ControllerComponents,
                                    langs: Langs) extends AbstractController(component) with I18nSupport {
  val lang: Lang = langs.availables.head
  implicit val messages: Messages = MessagesImpl(lang, messagesApi)

  def index = Action { implicit request =>
    val messages: Messages = messagesApi.preferred(request)   // get the messages for the given request
    val message: String = messages("default.message")
    Ok(views.html.index(message))
  }

  def homePageInFrench = Action {
    Redirect("/").withLang(Lang("fr"))    // set french language in the Play's language cookie for future requests 
  }

  def homePageWithDefaultLang = Action {
    Redirect("/").clearingLang           // discarding the language cookie set by withLang
  }
}