I can't test VisualEditor when ContentTranslation is enabled, because I get this

TypeError: $trigger.data(...).$dialog is undefined load.php:4:588
"Exception in store-localstorage-update:" load.php:177:555
"NS_ERROR_DOM_QUOTA_REACHED: Persistent storage maximum size reached" DOMException >[NS_ERROR_DOM_QUOTA_REACHED: "Persistent storage maximum size reached"
code: 1014
nsresult: 0x805303f6
location: https://pt.wikipedia.org/w/load.php?debug=false&lang=pt-br&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=4%2BsuyLdS:175]

when I access
https://pt.wikipedia.org/w/index.php?title=Usu%C3%A1rio%28a%29:He7d3r/Testes&veaction=edit
using Firefox 38 on linux. Apparently, that comes from

$trigger.data('callout').$dialog.find('li.cx-campaign-translations').replaceWith(getTranslationsItem());

https://github.com/wikimedia/mediawiki-extensions-ContentTranslation/blob/88324ec56bd780ce1d27df70c819a8a165181990/modules/campaigns/ext.cx.campaigns.contributionsmenu.js#L123
because VisualEditor works again if I disable the beta feature on
https://pt.wikipedia.org/wiki/Special:Preferences#mw-prefsection-betafeatures

(originally reported on T101406)