app/views/notifications/_notification_body.html.erb
<p>
<% if notification && notification.notifiable_action %>
<em>
<%= t("notifications.notification.action.#{notification.notifiable_action}",
count: notification.counter) %>
</em>
<% end %>
<strong id="<%= dom_id(notification) if notification %>_title">
<%= title %>
</strong>
<% if body %>
<p><%= body %></p>
<% end %>
</p>
<p class="time">
<%= l(timestamp, format: :datetime) %>
</p>