translated "6.3.4. Eager and Lazy Fetching"
translated "6.3.1. Saving and Updating"
translated "6.3.3. Cascades"
translated "6.3.2 Deleting Objects"
Merge pull request #35 from nttsoft/pr-GORM-deletingObjects

translated "6.3.2 Deleting Objects"
Merge pull request #36 from nttsoft/pr-GORM-cascades

translated "6.3.3. Cascades"
Merge pull request #37 from nttsoft/pr-GORM-savingAndUpdating

translated "6.3.1. Saving and Updating"
Merge pull request #38 from nttsoft/pr-GORM-fetching

translated "6.3.4. Eager and Lazy Fetching"