Found at https://www.mediawiki.org/wiki/MediaWiki-Vagrant?veaction=edit tested in Firefox 44.0.2 on Mac OS X.
Starting up VisualEditor on a page that can't be visual-edited because of the use of Extension:Translate pops up a warning about that fact; however if you click into the content area and hit cmd+F, the find/replace dialog bar overlaps with the warning message, making it hard to read:
The warning message should ideally bump down below the find/replace bar, or else the find/replace bar should not be activateable in this situation (for one thing you can't replace anything! ;)
