Update error message copy

These updates are based on the feedbacks from Kati Tirbhowan and from
discussions in the team.

This might change in future based on the feedback.

app/controllers/homepage_controller.rb

@@ -28,19 +28,20 @@ def update
     render "homepage/popular_links/edit"
   rescue StandardError => e
     Rails.logger.error "Error #{e.class} #{e.message}"
-    flash[:danger] = "Due to an application error, the edition couldn't be saved."
+    flash[:danger] = "Due to an application error, the edition couldn't be saved. #{try_again_message} #{raise_support_error_message}"
     render "homepage/popular_links/edit"
   end
 
   def publish
+    flash[:danger] = "Due to an application error, the edition couldn't be published. #{try_again_message} #{raise_support_error_message}"
     @latest_popular_links.publish_latest
 
     flash[:success] = "Popular links successfully published.".html_safe
   rescue GdsApi::HTTPErrorResponse => e
     flash[:danger] = rescue_already_published_error(e)
   rescue StandardError => e
     Rails.logger.error "Error #{e.class} #{e.message}"
-    flash[:danger] = "Due to an application error, the edition couldn't be published."
+    flash[:danger] = "Due to an application error, the edition couldn't be published. #{try_again_message} #{raise_support_error_message}"
   ensure
     redirect_to show_popular_links_path
   end
@@ -74,7 +75,7 @@ def cannot_delete_published_error_message
   end
 
   def application_error_message
-    "Due to an application error, the draft couldn't be deleted.".html_safe
+    "Due to an application error, the draft couldn't be deleted. #{try_again_message} #{raise_support_error_message}".html_safe
   end
 
   def rescue_already_published_error(error)
@@ -109,4 +110,12 @@ def remove_leading_and_trailing_url_spaces(links)
     end
     link_items
   end
+
+  def raise_support_error_message
+    "If the problem persists #{support_link}"
+  end
+
+  def support_link
+    "<a href=\"#{Plek.external_url_for('support.service')}/technical_fault_report/new\">please raise a support ticket</a>"
+  end
 end

test/functional/homepage_controller_test.rb

@@ -130,7 +130,7 @@ class HomepageControllerTest < ActionController::TestCase
                                      "5" => { "title" => "title5", "url" => "/url5" },
                                      "6" => { "title" => "title6", "url" => "/url6" } } }
 
-        assert_equal "Due to an application error, the edition couldn't be saved.", flash[:danger]
+        assert_equal "Due to an application error, the edition couldn't be saved. Please wait for a few minutes and try again. If the problem persists <a href=\"#{Plek.external_url_for('support.service')}/technical_fault_report/new\">please raise a support ticket</a>", flash[:danger]
       end
 
       should "render edit template" do
@@ -223,7 +223,7 @@ class HomepageControllerTest < ActionController::TestCase
       should "alert 'application error'" do
         post :publish, params: { id: @popular_links.id }
 
-        assert_equal "Due to an application error, the edition couldn't be published.", flash[:danger]
+        assert_equal "Due to an application error, the edition couldn't be published. Please wait for a few minutes and try again. If the problem persists <a href=\"#{Plek.external_url_for('support.service')}/technical_fault_report/new\">please raise a support ticket</a>", flash[:danger]
       end
     end
 
@@ -300,7 +300,7 @@ class HomepageControllerTest < ActionController::TestCase
 
         delete :destroy, params: { id: @popular_links.id }
 
-        assert_equal "Due to an application error, the draft couldn't be deleted.", flash[:danger]
+        assert_equal "Due to an application error, the draft couldn't be deleted. Please wait for a few minutes and try again. If the problem persists <a href=\"#{Plek.external_url_for('support.service')}/technical_fault_report/new\">please raise a support ticket</a>", flash[:danger]
         assert_redirected_to show_popular_links_path
       end
     end
@@ -328,7 +328,7 @@ class HomepageControllerTest < ActionController::TestCase
 
         delete :destroy, params: { id: @popular_links.id }
 
-        assert_equal "Due to an application error, the draft couldn't be deleted.", flash[:danger]
+        assert_equal "Due to an application error, the draft couldn't be deleted. Please wait for a few minutes and try again. If the problem persists <a href=\"#{Plek.external_url_for('support.service')}/technical_fault_report/new\">please raise a support ticket</a>", flash[:danger]
         assert_redirected_to show_popular_links_path
       end
     end