create component for sidemenu and add locales for raw text

app/components/dsfr/sidemenu_component.rb

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+class Dsfr::SidemenuComponent < ApplicationComponent
+  renders_many :links, "LinkComponent"
+
+  class LinkComponent < ApplicationComponent
+    attr_reader :name, :url
+    def initialize(name:, url:)
+      @name = name
+      @url = url
+    end
+  end
+
+  def active?(url)
+    current_page?(url)
+  end
+end

app/components/dsfr/sidemenu_component/sidemenu_component.en.yml

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+---
+fr:
+  btn_collapse_text: In this section

app/components/dsfr/sidemenu_component/sidemenu_component.fr.yml

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+---
+fr:
+  btn_collapse_text: Dans cette rubrique

app/components/dsfr/sidemenu_component/sidemenu_component.html.haml

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+
+%nav.fr-sidemenu{ "aria-labelledby" => "fr-sidemenu-title" }
+  .fr-sidemenu__inner
+    %button.fr-sidemenu__btn{ "aria-controls" => "fr-sidemenu-wrapper", "aria-expanded" => "false", hidden: "" }= t('.btn_collapse_text')
+    #fr-sidemenu-wrapper.fr-collapse
+      %ul.fr-sidemenu__list
+        - links.each do |link|
+          %li{ class: "fr-sidemenu__item fr-sidemenu__item#{active?(link.url) ? '--active' : ''}" }
+            = link_to link.name, link.url, class: 'fr-sidemenu__link', 'aria-current': active?(link.url) ? 'page' : nil, target: "_self"