[Bootbox] How to change default button and button color in confirmation dialog?

Problem
The confirmation dialog looks like:

I would like to change the default button in confirmation dialog from "確認"(confirm) to "取消"(cancel). 
Owing to confirm to do delete is a dangerous action, so I would like to change it color to red.

How to meet the two requirements?

The original code snippet is as following:

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$scope.remove = function() { bootbox.confirm({ message:'是否確定要刪除', buttons: { confirm: { label: '確認' }, cancel: { label: '取消' } }, callback:function(isConfirmed) { if(isConfirmed) { // .... } } }); };

How-to
Add btn-danger class name to confirm button, then the button color will change to red.
Add btn-primary class to cancel button, then the default button will be cancel button.

The updated code snippet is as bellows:

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$scope.remove = function() { bootbox.confirm({ message:'是否確定要刪除', buttons: { confirm: { label: '確認', className: 'btn-danger' }, cancel: { label: '取消', className: 'btn-primary' } }, callback:function(isConfirmed) { if(isConfirmed) { // .... } } }); };

Updated screenshot: