Log Message:
Update to 3.0.6. From the changelog:

* singinterval bugfix: don't crash if last question in tests is anwered wrongly.
* chord-m7-7-maj7-m7b5-dim7 and chord-m9-9-7b9-maj79: Don't crash
    when running tests.
* Add the singanswer lesson files to the pratise menu.
* Correctly connect ComboBoxEntry events in preferences window.
* Don't show GtkWarnings in the traceback window. Added --show-gtk-warnings
    commandline options for those who want to see them.
* Fixed the singanswer module and added some "Sing chord tone"
    exercises to the practise menu.
* updated no.po
* Added gui in the preferences window to select the language to be
    used. Use this if solfege does not select the correct one by default.
* Added swedish translations. Thanks to Daniel Nylander.
* Updated italian translation. Thanks to Marco Colombo.
* Build fixes to the linux midi module.
* Distribute all .po files in the windows build.