Fixes for: IZPACK-923, IZPACK-957 and IZPACK-958

[IZPACK-923]: Buttons in "Question" dialogs are not in the installer language 
[IZPACK-957]: IzPack 5 fails to generate auto install script with DOMException
[IZPACK-958]: IzPack5: navigation back to the target panel resets the already chosen installation path to the default value

Please see the issues for more details.