Fix typo - closes #164

when you can located -> when you **have** located

Author: timgdavies

prefix_finder/frontend/templates/list.html

@@ -20,7 +20,7 @@ <h1>{{ org_list.name.en }} <span>({{ org_list.code }})</span></h1>
           </div>
 
         <div class="single-sidebar__block single-sidebar--dark">
-          <p>The code for this list is <br/><code>{{ org_list.code }}</code>. When you can located the organization you wish to identify in this list, you should either:</p>
+          <p>The code for this list is <br/><code>{{ org_list.code }}</code>. When you have located the organization you wish to identify in this list, you should either:</p>
           <p>Enter it in an identifier database field prefixed with <code>{{ org_list.code }}</code>.</p>
           <h2>Example</h2>
           <pre>