Reproducible always for me by going to http://en.wikipedia.beta.wmflabs.org/wiki?title=Special:ContentTranslation&page=varasto&from=fi&to=de
Exception thrown by ext.cx.publish load.php?debug=false&lang=en&modules=jquery%2Cmediawiki%2CSpinner%7Cjquery.triggerQueueCallback%2Cl…:161
TypeError: Cannot set property 'publish' of undefined
TypeError {stack: (...), message: "Cannot set property 'publish' of undefined"}
Version: master
Severity: normal