Mondoku - Sodoku logic puzzle

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New level structure:
- Galleries are now divided into smaller chapters, which should make it easier and cheaper to try out new difficulties
- A new chapter was added to gallery 3-1 which players who already owned the gallery will receive for free
- The coins needed to unlock all puzzles in a gallery remain the same as before if no new chapters were added

Other:
- added visual indicators for chapters
- fixed a localization issue in German
- stability improvements and bug fixes