**As** a project management expert
**I want to** use the most common terms in project management
**so that** I don't get confused about different namings.

**Acceptance criteria**

* Begin of the insertionDelay is renamed to Lag
* End of the insertion API Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * DB Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Model Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Contracts Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Tests Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Documentation