Added slightly broken support for allowing user and admin customisation for turning on and off the AJAX page exit warning. Unsure of best way to debug with this codebase, but there is failure at the saving part for admin editing when saving settings, it seems to silently fail or simply do nothing. User editing seems to work fine. See line 44 in admin_actions.php, I suspect it has to do with the $sql_pass positioning/syntax. Other than that the feature appears to be working fine.

New appropriate language vars added for the feature, Japanese translation also provided. Installation script and update script also provided for new database column in user and admin tables
Added slightly broken support for allowing user and admin customisation for turning on and off the AJAX page exit warning. Unsure of best way to debug with this codebase, but there is failure at the saving part for admin editing when saving settings, it seems to silently fail or simply do nothing. User editing is fine, appears to be a problem at admin_actions.php on line 44 around $sql_pass. Other than that the feature appears to be working fine.

New appropriate language vars added for the feature, Japanese translation also provided. Installation script and update script also provided for new database column in user and admin tables