Changes in Version 1.21
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User-Visible changes
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    - New translations: Croatian, Czech, Danish, Scottish-Gaelic, and Slovak
    - updated remaining translations
    - fixed many English typos
    - Russian reference manual
    - rollover for options and rating buttons
    - 51 new Enigma levels (now a total of 984 main-pack levels, plus 21 tutorials)

Internal changes
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    - further rewrites of old-API levels to new API (only 212 old-API left)
    - many bug fixes