Updating for US English

Words found:
personalis*
customis*
organis*
colour
behaviour

app/templates/partials/templates/guidance-personalisation.html

@@ -1,10 +1,10 @@
 {% from "components/uk_components/inset-text/macro.njk" import govukInsetText %}
 
 <h2 class="heading-medium">
-  Personalisation
+  Personalization
 </h2>
 <p class="bottom-gutter-1-3">
-  Use double brackets to personalise your message:
+  Use double brackets to personalize your message:
 </p>
 {{ govukInsetText({
   "text": "Hello ((first name)), your reference is ((ref number))",