Translated introduction and summary (Chapter 4)
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Fixed typo in translate introduction and summary (Chapter 4)
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Merge pull request #52 from askras/patch-10

Translated introduction and summary (Chapter 4)
Merge pull request #57 from madhead/internals/refs

Translate Git internals - refs
Translated "Branch Management" (Chapter 3)
Merge pull request #63 from askras/patch-19

Translated "Branch Management" (Chapter 3)