ui: support search by displayname (#621)

packages/ui-default/templates/training_detail.html

@@ -18,7 +18,7 @@
         </li>
         <ul class="enroll_user_menu">
         {%- for uid, udoc in udict -%}
-        <li class="menu__item enroll_user_menu_item" data-uid="{{ uid }}" data-uname="{{ udoc.uname }}">
+        <li class="menu__item enroll_user_menu_item" data-uid="{{ uid }}" data-uname="{{ udoc.uname }}" {% if handler.user.hasPerm(perm.PREM_VIEW_DISPLAYNAME) and udoc.displayName %}data-displayname="{{ udoc.displayName }}"{% endif %}>
           <a href="./{{ tdoc._id }}?uid={{ uid }}" class="menu__link{% if (handler.request.query.uid or handler.user._id) == uid %} active{% endif %}">
             <span class="user-profile-link">
               <img class="small user-profile-avatar v-center" loading="lazy" src="{{ avatarUrl(udoc.avatar|default('')) }}" width="20" height="20">