templates/comments/_comments.haml
.tabbable.tabs-left
%ul.nav.nav-tabs
%li.nav-item
%a.nav-link{class: page == :comments_by_date ? 'active' : '', href: 'by_date.html'}= :comments_by_date.t
.tab-content
.tab-pane.active
.page-header
%h1.text-center= page.t
= high_stock('comments_by_date', charts.comments_by_date) if page == :comments_by_date