Add "Delete" button to Compare page

Description

Let's consider the flow:

1. We open the branches list;
2. Then we click "Compare" on some branch;
3. We see changes between the current and default branch and make desicion to delete the branch. In this case we have to go back to the branches list, find that branch again in the list, then click "Delete".

Proposal

The proposal is to add "Delete" button to Compare page. This button will delete the branch, mentioned in "to" field, with confirmation dialog.