Un-titlecase submit tag default value. E.g. "Create User" -> "Create user".

config-initializers-rails_overrides.rb

# Remove titlecase from submit tag default value.
# E.g. "Create User" -> "Create user".
class ActionView::Helpers::FormBuilder
  def submit_default_value_with_titlecase_removal
    old = submit_default_value_without_titlecase_removal

    model = if object.class.respond_to?(:model_name)
      object.class.model_name.human
    else
      @object_name.to_s.humanize
    end

    old.sub(model, model.mb_chars.downcase)
  end

  alias_method_chain :submit_default_value, :titlecase_removal
end