<div class="header-menu">
    <div class="item hidden-xs">
        <a href="/#/comment">
            <i class="fa fa-comment-o" aria-hidden="true"></i>
        </a>
    </div>
    <div class="item" ng-hide="isAuthenticated">
        <a class="clickable" href="/#/login">Login</a>
    </div>
    <div class="item hidden-very-xs" ng-hide="isAuthenticated">
        <a class="btn clickable register" href="/#/signup">Sign Up</a>
    </div>
    <div class="item" ng-show="isAuthenticated">
        <a class="btn clickable register" ng-click="logout()">Log Out</a>
    </div>
</div>