Herb: Pass `validation_mode` option to `Herb::Engine`

[yshmarov]

1. ERB output tags (<%= %>) are not allowed in attribute position. - what is your suggestion to fising this?

2. You can also disable this overlay by passing validation_mode: :none to Herb::Engine.

How exactly? smth like this does not work

Herb::Engine.configure do |config|
  config.validation_mode = :none
end

[marcoroth]

Hey @yshmarov, thanks for reporting!

<option value="<%= url_for(locale: locale) %>" <% if locale == I18n.locale %> selected <% end %>>

or:

<%= tag.option value: url_for(locale: locale), selected: locale == I18n.locale %>

2. that's a good point. The Herb::Engine exposes those options, but I guess there's currently no way for ReActionView to pass along these options.