17
In /class/textsanitizer/gallery/gallery.php
change line 9
$code = "<img src='".XOOPS_URL."/modules/extgallery/images/extgallery-posticon.gif' alt='" . _EXT_EXTGALLERY_ALTWMP . "' onclick='xoopsCodeGallery("{$textarea_id}", ""._EXT_EXTGALLERY_TEXTID."", ""._EXT_EXTGALLERY_TEXTTITLE."");' onmouseover='style.cursor="hand"'/> ";
to
$code = "<img src='".XOOPS_URL."/modules/extgallery/assets/images/extgallery-posticon.gif' alt='" . _EXT_EXTGALLERY_ALTWMP . "' onclick='xoopsCodeGallery("{$textarea_id}", ""._EXT_EXTGALLERY_TEXTID."", ""._EXT_EXTGALLERY_TEXTTITLE."");' onmouseover='style.cursor="hand"'/> ";
that will fix the _EXT_EXTGALLERY_ALTWMP problem
but it still doesn't fix the extension.png problem