I guess were getting closer to the solution. You should have a look to the languages/ folder. There should be a file YOURLANG.js besides a file YOURLANG.php. In this file ADVFRM_TX should be defined.
If the file doesn't exist, please check the languages/ folder's permissions. These should be set to 0755 or 0777. But however, an error should be reported by Advancedform_XH, if the YOURLANG.js couldn't be created.
If the file does exist, please check the HTML source code. It should contain the line:
Code: Select all
<script type="text/javascript" src="./../plugins/advancedform/languages/YOURLANG.js"></script>
Christoph