Add a step for translation support to the project wizards

When you create a new project in Qt Creator 4.11, you can automatically generate a translation source file (TS) for one language. You can add other languages later by editing the project file.

https://doc-snapshots.qt.io/qtcreator-4.11/creator-editor-external.html#using-qt-linguist

This would be very useful for supporting localization also in Qt Design Studio. Currently, users have to manually create a suitable .pro file and add it to the project.