Copy changes for the mandate 2SV page

As requested by Etain. Note that as discussed, I haven't made similar
changes to the "edit user" page, because that's about to be changed
significantly when we convert it to use the GOV.UK Design System.

app/views/users/two_step_verification_mandations/edit.html.erb

@@ -1,5 +1,5 @@
 <% content_for :title_caption, "Manage other users" %>
-<% content_for :title, "Mandate 2-step verification for #{@user.name}" %>
+<% content_for :title, "Turn on 2-step verification for #{@user.name}" %>
 
 <% content_for :breadcrumbs,
    render("govuk_publishing_components/components/breadcrumbs", {
@@ -18,7 +18,7 @@
          url: edit_user_path(@user),
        },
        {
-         title: "Mandate 2-step verification",
+         title: "Turn on 2-step verification",
        }
      ]
    })
@@ -42,15 +42,14 @@
   <div class="govuk-grid-column-two-thirds">
     <%= form_for @user, url: user_two_step_verification_mandation_path(@user) do |f| %>
       <%= render "govuk_publishing_components/components/hint", {
-        text: [
-          "Mandate 2-step verification for this user#{@user.exempt_from_2sv? ? ' (this will remove their exemption)' : nil}.",
-          "They will be prompted to set up 2-step verification again the next time they sign in.",
-        ].join(" ")
+        text: @user.exempt_from_2sv? ?
+          "This will remove the user's exemption from 2-step verification. They will have to set up 2-step verification the next time they sign in." :
+          "This forces the user to set up 2-step verification the next time they sign in."
       } %>
 
       <div class="govuk-button-group">
         <%= render "govuk_publishing_components/components/button", {
-          text: "Mandate 2-step verification",
+          text: "Turn on 2-step verification",
           destructive: @user.exempt_from_2sv?,
         } %>
         <%= link_to "Cancel", edit_user_path(@user), class: "govuk-link govuk-link--no-visited-state" %>

test/controllers/users/two_step_verification_mandations_controller_test.rb

@@ -18,7 +18,7 @@ class Users::TwoStepVerificationMandationsControllerTest < ActionController::Tes
 
         assert_template :edit
         assert_select "form[action='#{user_two_step_verification_mandation_path(user)}']" do
-          assert_select "button[type='submit']", text: "Mandate 2-step verification"
+          assert_select "button[type='submit']", text: "Turn on 2-step verification"
           assert_select "a[href='#{edit_user_path(user)}']", text: "Cancel"
         end
       end

test/support/managing_two_sv_helpers.rb

@@ -20,7 +20,7 @@ def assert_user_access_log_contains_messages(user, messages)
 
   def mandate_2sv_for_exempted_user
     click_link "Mandate 2-step verification for this user (this will remove their exemption)"
-    click_button "Mandate 2-step verification"
+    click_button "Turn on 2-step verification"
   end
 
   def admin_can_send_2sv_email(admin, user)
@@ -30,7 +30,7 @@ def admin_can_send_2sv_email(admin, user)
 
     perform_enqueued_jobs do
       click_link "Mandate 2-step verification for this user"
-      click_button "Mandate 2-step verification"
+      click_button "Turn on 2-step verification"
 
       assert last_email
       assert_equal "Make your Signon account more secure", last_email.subject