include_once XOOPS_ROOT_PATH.'/modules/xlanguage/api.php';
into XOOPS/include/common.php
RIGHT BEFORE
// #################### Include site-wide lang file ##################
if ( file_exists(XOOPS_ROOT_PATH."/language/".$xoopsConfig['language']."/global.php") ) {
include_once XOOPS_ROOT_PATH."/language/".$xoopsConfig['language']."/global.php";
} else {
include_once XOOPS_ROOT_PATH."/language/english/global.php";
}
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