I fixed this issue by updating the following file in the transposh plugin:
\wp-content\plugins\transposh-translation-filter-for-wordpress\core\constants.php
I changed line 121 to this: define(‘JQUERYUI_VER’, ‘1.12.1’);
1.12.1 was the latest version at the time of this post but I suppose you can go try other jqueryui versions that are available here: https://developers.google.com/speed/libraries/#jquery-ui
Hope that helps
