cleanup board names

[kuronekochomusuke]

• cleanup board names to match naming convention
• fix incorrect board size in names

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6268   +/-   ##
=========================================
  Coverage          ?   28.99%           
  Complexity        ?    13983           
=========================================
  Files             ?     2652           
  Lines             ?   268306           
  Branches          ?    47768           
=========================================
  Hits              ?    77802           
  Misses            ?   186623           
  Partials          ?     3881           

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