chore: Replace more cases of optimized

Author: petesfrench

templates/gcp/index.html

@@ -82,7 +82,7 @@ <h3>Ubuntu Pro for Google Cloud</h3>
           </div>
           <hr class="p-rule--muted" />
           <ul class="p-list--divided p-section--shallow">
-            <li class="p-list__item is-ticked">Includes all Ubuntu optimisations and updates of the free version</li>
+            <li class="p-list__item is-ticked">Includes all Ubuntu optimizations and updates of the free version</li>
             <li class="p-list__item is-ticked">
               Expanded security covering 28,000 additional application components delivered with Ubuntu
             </li>