imports/ui/pages/app-not-found.html
<template name="App_notFound">
<div class="page not-found">
<nav>
<div class="nav-group">
<a href="#" class="js-menu nav-item"><span class="icon-list-unordered"></span></a>
</div>
</nav>
<div class="content-scrollable">
<div class="wrapper-message">
<div class="title-message">{{_ 'Page not found'}}</div>
</div>
</div>
</div>
</template>