Added first run dialog

I have tried to follow how you have done your other dialogs, please excuse me if I haven't followed them very well.
![image](https://cloud.githubusercontent.com/assets/5103549/3177780/cfb041e0-ec13-11e3-88db-ac7579a77e75.png)

There should be enough time for LaunchFrame being initialized but updateLocale() could be moved outside from if clause. (Slow network could slow down LaunchFrame's constructor)