qrc/"Change language" action in project explorer does not work

The 'Change prefix' action in the context menu for a qrc prefix node in the Projects Pane does not work.

How to reproduce
Create e.g. a new "Qt QUick Application" for Qt Quick 2.0 via the wizard.
Right click on '/' node underneath qml.qrc, select "Change prefix..."
Type a new prefix

What happens

nothing

What I expect to happen

That the prefix is changed and the qml.qrc file is updated accordingly.

Originally tested on:

Qt Creator 3.3.0 (enterprise)
Based on Qt 5.4.0 (MSVC 2010, 32 bit)
Built on Dec 8 2014 at 15:22:08
From revision d36c4d87db

Related to QTCREATORBUG-11719