mamba please, update your package for tinymce with new structure folder (class/xoopseditor/tinymce/tiny_mce/.. and not class/xoopseditor/tinymce/tinymce/js/tiny_mce/..)
<{php}>
$language = $GLOBALS['xoopsConfig']['language'];
if(file_exists(XOOPS_ROOT_PATH.'/language/'.$language.'/style.css')){
echo "";
}
<{/php}>