Update text for email alert subscription link

The default wording for the email alert subscription link was updated to
no longer include the term "alert". This is causing TravelAdviceTest to
fail on this branch, as this test is checking for the now out-of-date
link text.

Author: danacotoran

test/integration/travel_advice_test.rb

@@ -11,7 +11,7 @@ class TravelAdviceTest < ActionDispatch::IntegrationTest
     assert page.has_css?("title", visible: false, text: @content_item["title"])
     assert_has_component_title(@content_item["details"]["country"]["name"])
 
-    assert page.has_css?("a[href=\"#{@content_item['details']['email_signup_link']}\"]", text: "Get email alerts")
+    assert page.has_css?("a[href=\"#{@content_item['details']['email_signup_link']}\"]", text: "Get emails")
     assert page.has_css?("a[href=\"#{@content_item['base_path']}.atom\"]", text: "Subscribe to feed")
 
     assert page.has_css?(".part-navigation li", count: @content_item["details"]["parts"].size + 1)