Fix link to worldwide office for translated worldwide organisations

We are currently linking the wrong place for worldwide offices on
translated worldwide organisation pages.

E.g. for the content item in the test, we are currrenlty linking to
`/world/uk-embassy-in-country.fr/office/british-embassy`, which results
in a 404 response.

app/presenters/worldwide_organisation_presenter.rb

@@ -85,7 +85,7 @@ def main_office
     WorldwideOffice.new(
       contact: WorldwideOrganisation::LinkedContactPresenter.new(office_contact_item),
       has_access_and_opening_times?: office_item["access_and_opening_times"].present?,
-      public_url: "#{content_item['base_path']}/#{office_item['slug']}",
+      public_url: "#{content_item['base_path'].gsub(/\..*?$/, '')}/#{office_item['slug']}",
     )
   end
 

test/presenters/worldwide_organisation_presenter_test.rb

@@ -164,6 +164,21 @@ def schema_name
     assert_nil presented.main_office
   end
 
+  test "#main_office returns the correct link when the worldwide organisation is not a translation" do
+    presented = create_presenter(WorldwideOrganisationPresenter, content_item: schema_item)
+
+    assert_equal "/world/uk-embassy-in-country/office/british-embassy", presented.main_office.public_url
+  end
+
+  test "#main_office returns the correct link when the worldwide organisation is a translation" do
+    content_item = schema_item
+    content_item["base_path"] = "#{content_item['base_path']}.fr"
+
+    presented = create_presenter(WorldwideOrganisationPresenter, content_item:)
+
+    assert_equal "/world/uk-embassy-in-country/office/british-embassy", presented.main_office.public_url
+  end
+
   test "#home_page_offices returns an empty array when there are no home page offices" do
     without_home_page_offices = schema_item
     without_home_page_offices["details"].delete("home_page_office_parts")