Show contact_email on about page

app/assets/javascripts/discourse/controllers/about.js.es6

@@ -0,0 +1,11 @@
+import ObjectController from 'discourse/controllers/object';
+
+export default ObjectController.extend({
+  contactInfo: function() {
+    if (Discourse.SiteSettings.contact_email) {
+      return I18n.t('about.contact_info', {contact_email: Discourse.SiteSettings.contact_email});
+    } else {
+      return null;
+    }
+  }.property()
+});

app/assets/javascripts/discourse/templates/about.hbs

@@ -61,11 +61,11 @@
     </table>
   </section>
 
-  <section class='about contact'>
-      <h3>{{i18n 'about.contact'}}</h3>
-      <p>
-          {{i18n 'about.contact_info' contact_email='name@example.com'}}
-      </p>
-  </section>
+  {{#if contactInfo}}
+    <section class='about contact'>
+        <h3>{{i18n 'about.contact'}}</h3>
+        <p>{{contactInfo}}</p>
+    </section>
+  {{/if}}
 
 </div>

config/site_settings.yml

@@ -21,6 +21,7 @@ required:
   site_description:
     default: ''
   contact_email:
+    client: true
     default: ''
     type: email
   notification_email: