Learning Sudoku

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1.005:
Small bug fix.
Further translation to French, thanks Christiane!!!

1.004:
Included an explicit Exit button in the main menu.
Tutorial in French and German. Thanks a lot to Christiane and Horst.

1.003:
Included new "Looking for Hidden Singles" section in the tutorial.

1.002:
Tutorial translated to German
Tutorial translated to Spanish
Minor enhancements