v0.2.0

• The built-in translations are now loaded automatically in non-Rails web frameworks. As a result, the Rodauth::I18n.add method has been removed.
• Third-party gems should now register their locale directories in post_configure by calling i18n_register. As a result, Rodauth::I18n.directories has been removed.
• The i18n_available_locales auth method has been added for setting which translations should be loaded (defaults to I18n.available_locales).
• The lib/rodauth-i18n.rb and lib/rodauth/i18n.rb files have been removed.
• Added translations for PT 🇵🇹 locale (thanks to @jsantos)