A lot :)

app/helpers/application_helper.rb

@@ -4,4 +4,16 @@ module ApplicationHelper
   include Pagy::Frontend
 
   delegate :filter_params, to: :controller
+
+  def multilang_form_field(form, attribute, as: :text_field)
+    col_width = as == :rich_text_area ? 12 : 12 / I18n.available_locales.count
+    tag.div(class: "row") do
+      fields = I18n.available_locales.map { _1.to_s.split("-").first }.map do |lang|
+        tag.div(class: "col-lg-#{col_width}") do
+          form.send(as, "#{attribute}_#{lang}")
+        end
+      end
+      safe_join(fields)
+    end
+  end
 end