Use ‘Continue’ not ‘Next’ for button text

The service manual recommends to:

> Make sure your ‘Continue’ button is:
>
> - labelled ‘Continue’, not ‘Next’
> - aligned to the left so users don’t miss it

– https://www.gov.uk/service-manual/design/question-pages

app/templates/views/support/index.html

@@ -17,7 +17,7 @@
 
         <form method="post" class="bottom-gutter-2">
           {{ radios(form.support_type) }}
-          {{ page_footer('Next') }}
+          {{ page_footer('Continue') }}
         </form>
 
         <h2 class="heading-medium">

app/templates/views/support/triage.html

@@ -15,7 +15,7 @@
       </h1>
       <form method="post">
         {{ radios(form.severe) }}
-        {{ page_footer('Next') }}
+        {{ page_footer('Continue') }}
       </form>
       <h2 class="heading-small">
         It’s only an emergency if: