Add a new header filter on filter.html

Hi

I try to add a new header filter on filter.html of SqWebMail

when edit the /usr/local/share/sqwebmail/html/en-us/filter.html in

<td rowspan="2">Encabezado| [#select:headername#]
                                 [#option:From:headername:From#]
                                 Remitente (From)
                                 [#option:To:headername:To#]
                                 Para (To)
                                 [#option:Cc:headername:Cc#]
                                 Con copia (Cc)
                                 [#option:Subject:headername:Subject#]
                                 Asunto (Subject)
                                
[#option:X-Spam-Level:headername:Spam#] /*  New option add*/
                                 Spam (X-Spam-Level)
                                 [#option:Date:headername:Date#]
                                 Fecha (Date)
                                 [#endselect#]

my browser show (source page)

<td rowspan="2">Encabezado <select name="headername">

                                          <option value="From">
                                          Remitente (From)
                                          <option value="To">
                                          Para (To)
                                          <option value="Cc">
                                          Con copia (Cc)
                                          <option value="Subject">
                                          Asunto (Subject)
                                         
[#option:X-Spam-Level:headername:Spam#] /*  New option add no rendered
*/
                                          Spam (X-Spam-Level)
                                          <option value="Date">
                                          Fecha (Date)
                                          </select>

Someone has had this type of problem?

How can it be resolved?

Thank in advance

-- 
Alvaro Jesus Hernandez Arteaga
[email protected]
Universidad de Carabobo
Carabobo/Venezuela