Fixed 2 problems when using a joystick.

- Fixed the first run language dialogue selecting the language when using
  the joystick arrows. Thanks to qubodup for pointing that one out in his video.

- Fixed the game quitting when pushing start/esc with a gamepad.
  The pad key is still working elsewhere but the user has to select Quit explicitely
  to leave the game in that case. Thanks to SuiteCake for the report.

In both cases, the keyboard behaviour hasn't changed.

Closes #276