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

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