Adjust wording of first paragraph

I’ve swapped the order of the first paragraph so it joins into one
sentence, and leads with ‘Notify has not broadcast your alert’ which
is the response to what the user has just done. I don’t think we need
to say ‘still’ because the idea is users will swap back and forth
between training and real depending on the situation.

app/templates/views/broadcast/tour/6.html

@@ -3,7 +3,7 @@
 {% extends "admin_template.html" %}
 
 {% block per_page_title %}
-  You’re still in training mode. Notify has not broadcast your alert.
+  Notify has not broadcast your alert because you’re still in training mode.
 {% endblock %}
 
 {% set mainClasses = "govuk-!-padding-top-0 govuk-!-padding-bottom-0" %}
@@ -20,7 +20,7 @@
     <div class="govuk-grid-row">
       <div class="govuk-grid-column-one-half">
         <h1 class="heading-medium">
-          You’re still in training mode. Notify has not broadcast your alert.
+          Notify has not broadcast your alert because you’re still in training mode.
         </h1>
         <p class="govuk-body heading-medium">
           In a real emergency, every mobile phone in the area