Issue #3567

Description

• I have renamed the title of Amount for edit dialog. Now it is a "Currently Available Balance" (to avoid misunderstanding)
• Fixed the balance check to avoid the fake error which blocked the edit
• Fixed the delta amount which sends to the blockchain
• Added the "Total to Repay" for Repay window (I had a misunderstanding and insufficient balance error, so I decided to display for a user the sum that gonna be withdrawn from his account (credit fee + repay amount)

Closes #3567