New option: auto-select language by HTTP header

Contribute Feature
11

I think you need to update your version of discourse. ensure_all_loaded! was recently added.

Here’s the main method that the plugin is overriding from application_controller.rb

  def set_locale
    I18n.locale = current_user.try(:effective_locale) || SiteSetting.default_locale
    I18n.ensure_all_loaded!
  end