zammad/public/assets/chat/views/customer_timeout.eco

<div class="zammad-chat-modal">
  <div class="zammad-chat-modal-text">
    <% if @agent: %>
      <%- @T('Since you didn\'t respond in the last %s minutes your conversation with <strong>%s</strong> got closed.', @delay, @agent) %>
    <% else: %>
      <%- @T('Since you didn\'t respond in the last %s minutes your conversation got closed.', @delay) %>
    <% end %>
    <br>
    <div class="zammad-chat-button js-restart"<%= " style='background: #{ @background }'" if @background %>><%- @T('Start new conversation') %></div>
  </div>
</div>