1.5.2
  * added Portuguese translation
  * made the winner and the highest points more colourful
  * activated hardware back-button to leave the game or go to previous screen
  * fixed Polish and Esperanto translations (by Verdulo)
  * bugfix: language selection sometimes not working
  * added GPL3 and gitlab badges to background

1.5.1
  * Keep the screen on a bit longer, as long the the game is actively being played.

1.5.0
  * added achievements
  * bugfix: don't increment overall points when round repeats due to losing against computer

