Update the Brexit "banner"

Content designers have come up with some text that we hope people will understand
better.

https://trello.com/c/ijTzb33b/347-change-the-brexit-banner-on-whitehall-pages

app/presenters/content_item/no_deal_notice.rb

@@ -23,11 +23,11 @@ def no_deal_notice_links
     end
 
     def no_deal_notice_title
-      "The UK has left the EU"
+      "The UK has left the EU and the transition period after Brexit comes to an end this year."
     end
 
     def no_deal_notice_description
-      "This page tells you what you'll need to do from 1 January 2021. It'll be updated if anything changes. "
+      "This page tells you what you'll need to do from 1 January 2021. It will be updated if anything changes."
     end
 
     def no_deal_notice_link_intro
@@ -43,7 +43,7 @@ def no_deal_landing_page_cta
       }
 
       featured_link = view_context.link_to("the transition period", "/transition", data: data_attributes, class: "govuk-link")
-      featured_link_intro = no_deal_notice_links.any? ? "You can also read about" : "You can read about"
+      featured_link_intro = no_deal_notice_links.any? ? "You can also read about" : "Check what else you need to do during"
 
       (featured_link_intro + " " + featured_link + ".").html_safe
     end