redmine/app/views/twofa/_twofa_code_form.html.erb

<div class="box">
  <p><%=l 'twofa_label_enter_otp' %></p>
  <div class="tabular">
    <p>
      <label for="twofa_code"><%=l 'twofa_label_code' -%></label>
      <%= text_field_tag :twofa_code, nil, autocomplete: 'off' -%>
    </p>
  </div>
</div>