Remove brand helper from translation nav component

app/views/govuk_publishing_components/components/_translation_nav.html.erb

@@ -1,13 +1,11 @@
 <%
   add_gem_component_stylesheet("translation-nav")
 
-  brand ||= false
-  brand_helper = GovukPublishingComponents::AppHelpers::BrandHelper.new(brand)
   translation_helper = GovukPublishingComponents::Presenters::TranslationNavHelper.new(local_assigns)
 %>
 <% if translation_helper.has_translations? %>
   <nav role="navigation"
-    class="gem-c-translation-nav govuk-!-display-none-print <%= translation_helper.classes %> <%= brand_helper.brand_class %>"
+    class="gem-c-translation-nav govuk-!-display-none-print <%= translation_helper.classes %>"
     aria-label="<%= t("common.translations") %>"
   >
     <ul class="gem-c-translation-nav__list">
@@ -20,7 +18,7 @@
               hreflang: translation[:locale],
               lang: translation[:locale],
               rel: "alternate",
-              class: "govuk-link gem-c-translation-nav__link #{brand_helper.color_class}",
+              class: "govuk-link gem-c-translation-nav__link",
               data: translation[:data_attributes]
             %>
           <% end %>

app/views/govuk_publishing_components/components/docs/translation_nav.yml

@@ -61,18 +61,6 @@ examples:
           active: true
     context:
       right_to_left: true
-  with_branding:
-    description: Organisation [colour branding](https://github.com/alphagov/govuk_publishing_components/blob/main/docs/component_branding.md) can be added to the component as shown.
-    data:
-      brand: 'wales-office'
-      translations:
-      - locale: 'en'
-        base_path: '/en'
-        text: 'English'
-        active: true
-      - locale: 'cy'
-        base_path: '/cy'
-        text: 'Cymraeg'
   with_no_top_margin:
     data:
       no_margin_top: true

spec/components/translation_nav_spec.rb

@@ -70,12 +70,6 @@ def multiple_translations
     assert_select "nav[role='navigation'][aria-label='Translations']"
   end
 
-  it "adds branding correctly" do
-    render_component(translations: multiple_translations, brand: "attorney-generals-office")
-    assert_select ".gem-c-translation-nav.brand--attorney-generals-office"
-    assert_select ".gem-c-translation-nav .brand__color"
-  end
-
   it "has no margin top when option passed" do
     render_component(translations: multiple_translations, no_margin_top: true)
     assert_select ".gem-c-translation-nav--no-margin-top"