Center username vertically (#163)

Center username/role container vertically within header

Author: meyerluk

src/frontend/js/app/ui/header/main.ejs

@@ -4,7 +4,7 @@
             <img src="/images/favicons/favicon-32x32.png" border="0"> &nbsp; <%- i18n('main', 'app') %>
         </a>
 
-        <div class="d-flex order-lg-2 ml-auto">
+        <div class="d-flex align-items-center order-lg-2 ml-auto">
             <div class="dropdown">
                 <a href="#" class="nav-link pr-0 leading-none" data-toggle="dropdown">
                     <span class="avatar" style="background-image: url(<%- getUserField('avatar', '/images/default-avatar.jpg') %>)"></span>