Panel content not loaded in non-english Photoshop

Hello. I have created this Panel ( http://circografico.com.ar/shop/downloads/ad-artbox-lite/ ) that works perfect in Photoshop CS6 - english version - both in Windows and Mac,

but when someone try to use it in a spanish Photoshop version, it loads a white canvas instead of my panel interface, I mean, no HTML is loaded. So I'm deducting there's some

kind of trouble with the localization of the files. Maybe my installation file (.MXI) needs some adjustment or tweak...

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<macromedia-extension name="AD Artbox lite" requires-restart="true" version="1.0">

  <author name="Alex Dukal"/>

  <description><![CDATA[AD Artbox lite is a reduced version of AD Artbox. It contains more than 40 'artistic' and useful tools for graphic artists,

  but a dozen less than the full version. It contains high-quality tools to produce different kind of artworks.

  Please read the User Manual to clearify doubts and understand how to modify or adapt the panel to your needs.]]></description>

  <license-agreement><![CDATA[©2013 Alex Dukal, all rights reserved.]]></license-agreement>

  <products>

    <product familyname="Photoshop" maxversion="" primary="true" version="12.0"/>

  </products>

  <files>

    <file destination="" file-type="CSXS" products="" source="AD_Artbox_lite.zxp"/>

    <file destination="$tools" products="Photoshop,Photoshop32,Photoshop64" source="AD_Artbox_lite.tpl"/>

    <file destination="$patterns" products="Photoshop,Photoshop32,Photoshop64" source="AD_Artbox_lite.pat"/>

    <file destination="$actions" products="Photoshop,Photoshop32,Photoshop64" source="AD_Artbox_lite.atn"/>

  <file destination="$photoshopappfolder" products="Photoshop,Photoshop32,Photoshop64" source="AD-Artbox_lite_User-Manual.pdf"/>

  <file destination="$scripts" products="Photoshop,Photoshop32,Photoshop64" source="AD_Artbox_lite_Install.jsx"/>

  </files>

</macromedia-extension>

Any help will be welcome! Thx in advance.