The error is present in wmf.29 and wmf.30 (and in cx testing). The Console error appears repeatedly while typing any title (including leaving it blank).
- Start translating any article.
- On the ContentTranslation page change the title to anything - e.g. 'Test', the following error will be displayed in the Console:
[CX] Invalid target title mw.cx.TranslationController.onTargetTitleChange oo.EventEmitter.emit ve.init.mw.CXTarget.onTargetTitleChange oo.EventEmitter.emit oo.EventEmitter.emit OO.ui.InputWidget.setValue (anonymous) setTimeout (async) OO.ui.InputWidget.onEdit dispatch elemData.handle