Fix translation scope within modals (#404)

* Patch virtual_path within modal helper

Added an example translation within the modal to test.

* Fix modal translation scope

By changing this to a partial that accepts the content via a local var
instead of a layout the virtual path, and therefore translation scope is
not changed.

app/helpers/application_helper.rb

@@ -14,6 +14,7 @@ module ApplicationHelper
   # Wrap view with <%= modal do %> ... <% end %> to have it open in a modal
   # Make sure to add data-turbo-frame="modal" to the link/button that opens the modal
   def modal(&block)
-    render "shared/modal", &block
+    content = capture &block
+    render partial: "shared/modal", locals: { content: content }
   end
 end