Yes to Change to : $SITE['uomPerHour'] = '/time';
You're free to add stuff to your footer.php to appear on all pages on your site.
I see you fixed ajaxWDwx.js to have:
var clientrawFile = '/vejr/webfiles/clientraw.txt'; // location of clientraw.txt relative to this page on website
so it points to the URL path of the clientraw.txt file. The AJAX updates are now happening.
and in Settings-weather.php, the location of the WD uploads is set to ./webfiles/ also.
Your site appears to be working properly as shown in the wxstatus.php page.
Good job with the updates!