On hu.wiktionary the summary window hangs when clicking on preview. The traceback from the console seems to explain it pretty well:
```
This page is using the deprecated ResourceLoader module "jquery.ui.widget".
load.php:31:942
This page is using the deprecated ResourceLoader module "jquery.ui.core".
Please use OOUI instead.
load.php:1:80
TypeError: $.Deferred.resolve is not a function[Learn More]
load.php:668:454
ve.ui.MWSaveDialog.prototype.showPreview
https://hu.wiktionary.org/w/load.php:668:454
ve.init.mw.ArticleTarget.prototype.onSaveDialogPreview/<
https://hu.wiktionary.org/w/load.php:630:164
fire
https://hu.wiktionary.org/w/load.php:46:599
fireWith
https://hu.wiktionary.org/w/load.php:47:824
Deferred/</deferred[tuple[0]]
https://hu.wiktionary.org/w/load.php:51:312
ajax/xhr<
https://hu.wiktionary.org/w/load.php:501:398
fire
https://hu.wiktionary.org/w/load.php:46:599
fireWith
https://hu.wiktionary.org/w/load.php:47:824
done
https://hu.wiktionary.org/w/load.php:126:165
callback/<
```