title: How to set Rails engine locale (it's using :en even tough host app has a different locale)
body: <p>I followed the great Rails guide on engines (<a href="https://guides.rubyonrails.org/engines.html" rel="nofollow noreferrer">https://guides.rubyonrails.org/engines.html</a>) and managed to get my engine working in a host app.</p>
  
  <p>However, the engine is loading only the <code>en.yml</code> locale, even tough the host application has <code>I18n.default_locale</code> and <code>I18n.locale</code> both set to <code>pt-br</code>, and I have a <code>config/locales/pt-br.yml</code> file in my engine.</p>
  
  <p>The guide only states that "For locales, simply place the locale files in the config/locales directory, just like you would in an application.", but apparently I need to do something else.</p>
  
  <p>How would I make the engine to load the correct I18n locale files, based on the host app settings? If that's not possible, how the host app could set this locale in an initializer file, like a config option?</p>